How to increase code efficiency in a while loop (using PXI5105 for sampling outside signal digitalizer)

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  JJMack Chuck Uebele Nicolas Ribot SuperMerlin
  

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  #target photoshop
  
  var idExpr = charIDToTypeID( "Expr" );
      var desc19 = new ActionDescriptor();
      var idUsng = charIDToTypeID( "Usng" );
          var desc20 = new ActionDescriptor();
          var idOp = charIDToTypeID( "Op  " );
          var idSWOp = charIDToTypeID( "SWOp" );
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          var idMtt = charIDToTypeID( "Mtt " );
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          var idEICC = charIDToTypeID( "EICC" );
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          var idMttG = charIDToTypeID( "MttG" );
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          var idMttB = charIDToTypeID( "MttB" );
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          var idSImg = charIDToTypeID( "SImg" );
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          var idSWsl = charIDToTypeID( "SWsl" );
          var idSTsl = charIDToTypeID( "STsl" );
          var idSLAl = charIDToTypeID( "SLAl" );
          desc20.putEnumerated( idSWsl, idSTsl, idSLAl );
          var idSWch = charIDToTypeID( "SWch" );
          var idSTch = charIDToTypeID( "STch" );
          var idCHsR = charIDToTypeID( "CHsR" );
          desc20.putEnumerated( idSWch, idSTch, idCHsR );
          var idSWmd = charIDToTypeID( "SWmd" );
          var idSTmd = charIDToTypeID( "STmd" );
          var idMDCC = charIDToTypeID( "MDCC" );
          desc20.putEnumerated( idSWmd, idSTmd, idMDCC );
          var idohXH = charIDToTypeID( "ohXH" );
          desc20.putBoolean( idohXH, false );
          var idohIC = charIDToTypeID( "ohIC" );
          desc20.putBoolean( idohIC, true );
          var idohAA = charIDToTypeID( "ohAA" );
          desc20.putBoolean( idohAA, true );
          var idohQA = charIDToTypeID( "ohQA" );
          desc20.putBoolean( idohQA, true );
          var idohCA = charIDToTypeID( "ohCA" );
          desc20.putBoolean( idohCA, false );
          var idohIZ = charIDToTypeID( "ohIZ" );
          desc20.putBoolean( idohIZ, true );
          var idohTC = charIDToTypeID( "ohTC" );
          var idSToc = charIDToTypeID( "SToc" );
          var idOCzerothree = charIDToTypeID( "OC03" );
          desc20.putEnumerated( idohTC, idSToc, idOCzerothree );
          var idohAC = charIDToTypeID( "ohAC" );
          var idSToc = charIDToTypeID( "SToc" );
          var idOCzerothree = charIDToTypeID( "OC03" );
          desc20.putEnumerated( idohAC, idSToc, idOCzerothree );
          var idohIn = charIDToTypeID( "ohIn" );
          desc20.putInteger( idohIn, -1 );
          var idohLE = charIDToTypeID( "ohLE" );
          var idSTle = charIDToTypeID( "STle" );
          var idLEzerothree = charIDToTypeID( "LE03" );
          desc20.putEnumerated( idohLE, idSTle, idLEzerothree );
          var idohEn = charIDToTypeID( "ohEn" );
          var idSTen = charIDToTypeID( "STen" );
          var idENzerozero = charIDToTypeID( "EN00" );
          desc20.putEnumerated( idohEn, idSTen, idENzerozero );
          var idolCS = charIDToTypeID( "olCS" );
          desc20.putBoolean( idolCS, false );
          var idolEC = charIDToTypeID( "olEC" );
          var idSTst = charIDToTypeID( "STst" );
          var idSTzerozero = charIDToTypeID( "ST00" );
          desc20.putEnumerated( idolEC, idSTst, idSTzerozero );
          var idolWH = charIDToTypeID( "olWH" );
          var idSTwh = charIDToTypeID( "STwh" );
          var idWHzeroone = charIDToTypeID( "WH01" );
          desc20.putEnumerated( idolWH, idSTwh, idWHzeroone );
          var idolSV = charIDToTypeID( "olSV" );
          var idSTsp = charIDToTypeID( "STsp" );
          var idSPzerofour = charIDToTypeID( "SP04" );
          desc20.putEnumerated( idolSV, idSTsp, idSPzerofour );
          var idolSH = charIDToTypeID( "olSH" );
          var idSTsp = charIDToTypeID( "STsp" );
          var idSPzerofour = charIDToTypeID( "SP04" );
          desc20.putEnumerated( idolSH, idSTsp, idSPzerofour );
          var idolNC = charIDToTypeID( "olNC" );
              var list4 = new ActionList();
                  var desc21 = new ActionDescriptor();
                  var idncTp = charIDToTypeID( "ncTp" );
                  var idSTnc = charIDToTypeID( "STnc" );
                  var idNCzerozero = charIDToTypeID( "NC00" );
                  desc21.putEnumerated( idncTp, idSTnc, idNCzerozero );
              var idSCnc = charIDToTypeID( "SCnc" );
              list4.putObject( idSCnc, desc21 );
                  var desc22 = new ActionDescriptor();
                  var idncTp = charIDToTypeID( "ncTp" );
                  var idSTnc = charIDToTypeID( "STnc" );
                  var idNConenine = charIDToTypeID( "NC19" );
                  desc22.putEnumerated( idncTp, idSTnc, idNConenine );
              var idSCnc = charIDToTypeID( "SCnc" );
              list4.putObject( idSCnc, desc22 );
                  var desc23 = new ActionDescriptor();
                  var idncTp = charIDToTypeID( "ncTp" );
                  var idSTnc = charIDToTypeID( "STnc" );
                  var idNCtwoeight = charIDToTypeID( "NC28" );
                  desc23.putEnumerated( idncTp, idSTnc, idNCtwoeight );
              var idSCnc = charIDToTypeID( "SCnc" );
              list4.putObject( idSCnc, desc23 );
                  var desc24 = new ActionDescriptor();
                  var idncTp = charIDToTypeID( "ncTp" );
                  var idSTnc = charIDToTypeID( "STnc" );
                  var idNCtwofour = charIDToTypeID( "NC24" );
                  desc24.putEnumerated( idncTp, idSTnc, idNCtwofour );
              var idSCnc = charIDToTypeID( "SCnc" );
              list4.putObject( idSCnc, desc24 );
                  var desc25 = new ActionDescriptor();
                  var idncTp = charIDToTypeID( "ncTp" );
                  var idSTnc = charIDToTypeID( "STnc" );
                  var idNCtwofour = charIDToTypeID( "NC24" );
                  desc25.putEnumerated( idncTp, idSTnc, idNCtwofour );
              var idSCnc = charIDToTypeID( "SCnc" );
              list4.putObject( idSCnc, desc25 );
                  var desc26 = new ActionDescriptor();
                  var idncTp = charIDToTypeID( "ncTp" );
                  var idSTnc = charIDToTypeID( "STnc" );
                  var idNCtwofour = charIDToTypeID( "NC24" );
                  desc26.putEnumerated( idncTp, idSTnc, idNCtwofour );
              var idSCnc = charIDToTypeID( "SCnc" );
              list4.putObject( idSCnc, desc26 );
          desc20.putList( idolNC, list4 );
          var idobIA = charIDToTypeID( "obIA" );
          desc20.putBoolean( idobIA, false );
          var idobIP = charIDToTypeID( "obIP" );
          desc20.putString( idobIP, """""" );
          var idobCS = charIDToTypeID( "obCS" );
          var idSTcs = charIDToTypeID( "STcs" );
          var idCSzeroone = charIDToTypeID( "CS01" );
          desc20.putEnumerated( idobCS, idSTcs, idCSzeroone );
          var idovNC = charIDToTypeID( "ovNC" );
              var list5 = new ActionList();
                  var desc27 = new ActionDescriptor();
                  var idncTp = charIDToTypeID( "ncTp" );
                  var idSTnc = charIDToTypeID( "STnc" );
                  var idNCzeroone = charIDToTypeID( "NC01" );
                  desc27.putEnumerated( idncTp, idSTnc, idNCzeroone );
              var idSCnc = charIDToTypeID( "SCnc" );
              list5.putObject( idSCnc, desc27 );
                  var desc28 = new ActionDescriptor();
                  var idncTp = charIDToTypeID( "ncTp" );
                  var idSTnc = charIDToTypeID( "STnc" );
                  var idNCtwozero = charIDToTypeID( "NC20" );
                  desc28.putEnumerated( idncTp, idSTnc, idNCtwozero );
              var idSCnc = charIDToTypeID( "SCnc" );
              list5.putObject( idSCnc, desc28 );
                  var desc29 = new ActionDescriptor();
                  var idncTp = charIDToTypeID( "ncTp" );
                  var idSTnc = charIDToTypeID( "STnc" );
                  var idNCzerotwo = charIDToTypeID( "NC02" );
                  desc29.putEnumerated( idncTp, idSTnc, idNCzerotwo );
              var idSCnc = charIDToTypeID( "SCnc" );
              list5.putObject( idSCnc, desc29 );
                  var desc30 = new ActionDescriptor();
                  var idncTp = charIDToTypeID( "ncTp" );
                  var idSTnc = charIDToTypeID( "STnc" );
                  var idNConenine = charIDToTypeID( "NC19" );
                  desc30.putEnumerated( idncTp, idSTnc, idNConenine );
              var idSCnc = charIDToTypeID( "SCnc" );
              list5.putObject( idSCnc, desc30 );
                  var desc31 = new ActionDescriptor();
                  var idncTp = charIDToTypeID( "ncTp" );
                  var idSTnc = charIDToTypeID( "STnc" );
                  var idNCzerosix = charIDToTypeID( "NC06" );
                  desc31.putEnumerated( idncTp, idSTnc, idNCzerosix );
              var idSCnc = charIDToTypeID( "SCnc" );
              list5.putObject( idSCnc, desc31 );
                  var desc32 = new ActionDescriptor();
                  var idncTp = charIDToTypeID( "ncTp" );
                  var idSTnc = charIDToTypeID( "STnc" );
                  var idNCtwofour = charIDToTypeID( "NC24" );
                  desc32.putEnumerated( idncTp, idSTnc, idNCtwofour );
              var idSCnc = charIDToTypeID( "SCnc" );
              list5.putObject( idSCnc, desc32 );
                  var desc33 = new ActionDescriptor();
                  var idncTp = charIDToTypeID( "ncTp" );
                  var idSTnc = charIDToTypeID( "STnc" );
                  var idNCtwofour = charIDToTypeID( "NC24" );
                  desc33.putEnumerated( idncTp, idSTnc, idNCtwofour );
              var idSCnc = charIDToTypeID( "SCnc" );
              list5.putObject( idSCnc, desc33 );
                  var desc34 = new ActionDescriptor();
                  var idncTp = charIDToTypeID( "ncTp" );
                  var idSTnc = charIDToTypeID( "STnc" );
                  var idNCtwofour = charIDToTypeID( "NC24" );
                  desc34.putEnumerated( idncTp, idSTnc, idNCtwofour );
              var idSCnc = charIDToTypeID( "SCnc" );
              list5.putObject( idSCnc, desc34 );
                  var desc35 = new ActionDescriptor();
                  var idncTp = charIDToTypeID( "ncTp" );
                  var idSTnc = charIDToTypeID( "STnc" );
                  var idNCtwotwo = charIDToTypeID( "NC22" );
                  desc35.putEnumerated( idncTp, idSTnc, idNCtwotwo );
              var idSCnc = charIDToTypeID( "SCnc" );
              list5.putObject( idSCnc, desc35 );
          desc20.putList( idovNC, list5 );
          var idovCM = charIDToTypeID( "ovCM" );
          desc20.putBoolean( idovCM, false );
          var idovCW = charIDToTypeID( "ovCW" );
          desc20.putBoolean( idovCW, true );
          var idovCU = charIDToTypeID( "ovCU" );
          desc20.putBoolean( idovCU, true );
          var idovSF = charIDToTypeID( "ovSF" );
          desc20.putBoolean( idovSF, true );
          var idovCB = charIDToTypeID( "ovCB" );
          desc20.putBoolean( idovCB, true );
          var idovSN = charIDToTypeID( "ovSN" );
          desc20.putString( idovSN, """c:\photos""" );//Here's where the default folder is suppose to go.
      var idSaveForWeb = stringIDToTypeID( "SaveForWeb" );
      desc19.putObject( idUsng, idSaveForWeb, desc20 );
  executeAction( idExpr, desc19, DialogModes.ALL );
  

• Code Golf: stop two while loops with guaranteed ratio iteration

  Proposal

  In the vein of the tradition of Perl, I would like to see if there is any interest to solve a few puzzles programming in LabVIEW. Can someone post a problem and define the rules to solve.

  Here's a question for beginning/intermediate to sharpen your "palette".

  Description

  With a user action, how you would stop two while loops such as the relationship between iterations is the still the same? Concrete to view this situation is to take action: both instruments use the same source of synchronization to take measures, but second divides the clock down so that it is a little slower than the first whole factor. For example, if the slower instrument is four times slower, then at the end of the VI, the slower instrument takes 100 measures the fastest instrument took 400.

  Rules

  • You can use vi.lib
  • You cannot include any other subVIs
  • Your solution should pass for loop1 interval as low as 25 ms

  Model (joint in LabVIEW 2009)
  

   

  If people are interested in this, then we will find a way to improve future problems. Please post your suggestions and criticisms, but only if you also post a presentation ;-)

  MacNorth wrote:

  [..]

  If we choose the first suggestions, the VI has yet to recover the data at different speeds. You can dedicate a loop for each instrument to disassociate a jitter and latency introduced by their connectivity or the inner workings. This adds a margin of safety when there is a conflict of thread and the pilot. You can also implement a simple counting as altenbach loop and renounce the multiloop complexity.
  [..]

  It is a very good point. But I wanted to make sure, you should / need to discuss the benefits, but also the disadvantages of the design. Implementation of an application is most often a process of 'special cases '. If a framework/design for a single application model does not necessarily correspond to another application.

  Designs are always strongly according to the requirements and constraints. What gives here designs will result in educational services, of course, but not necessarily as reference models for specific applications.

  Advantage of simple loop:

  • No synchronization between several loops required
  • Can easily implement any whole factor between services (quotent & function remains for a case structure

  Disadvantage of simple loop:

  • Take advantage of the multi core systems (at least not much)
  • Can easily run out of the time constraints (material not "not responding" enough, fast manipulation of data takes too long,...)
  • Code will accumulate within the structures of the case, where the readability could suff

  The advantage of multiple loops:

  • See essentially the disadvantages of single loop (several loops solve those)

  Disadvantage of multiple loops:

  • More complex, especially for the sync switch (not beginner friendly, requires a more/better design)
  • May contain easily questions source such as race conditions and locks

  A little side note:

  Even if the equipment works different acquisition rate, this does not necessarily that the software must use different rates for data extraction. You can use the same model of an hour, but get X times more values for the task faster than the slower running. The 'only' thing to care of are the sizes of buffers and bottlenecks in the data transfer.

  MacNorth wrote:

  [..] The best advice published OR shutter multiple while loops (https://www.google.com/search?q=labview+stop+multiple+while+loops) are laughable (and the 'solution' in my model). [..]

  No, it's not laughable. For many applications, this approach to shutter at the same time several loops running is OK. The constraint: only for simple parallel running loops.

  More complex loops (producer/consumer and similar) with the more complex data relationship ships require more valiant approaches such as queues, declaring events or user.

  My 5 cents only,

  Norbert

• How to 'continue' a 'while' loop using an "if"?

  I have a loop 'while' continuous operation, by taking a step at each iteration. In each such iteration I save this measure unique to the file AND display it on a chart. From time to time, I have "out-of-range" measures, which are displayed as 1E-37 or 1E + 37 on the graph and poured on the record, and are not relevant (for me, it is). With the help of a simple interpreter, like python, I could use an 'if' statement to check if the reading is indeed irrelevant and if so, 'continue' in the loop 'while' so that it stops the current iteration and starts a new.

  How we not implements such a thing in LabVIEW?

  Thank you

  Amit

  Hi Amit,

  There was no 'cynicism', not at all! You ask a few notions of LabVIEW base so I suggested where to find that...

  "but this would require having wrap all code inside the"while"loop."

  OK, then you should explain the difference of a IF/THEN construct textual languages. Made a simple

  IF test

  {do something here}

  ON THE OTHER

  {do something here}

  not wrap the code inside a structure?

  A CASE structure does exactly the same thing and I don't see anything more simple as followed by comparison of two cases. What is complicated in a case around another structure design code?

• How to make a graphic inside a while loop to maintain the previous values

  At first I tried to use a the VI Express XY graphics to create a track of points.  However, the chart is a trace linear between the first point in the new line and the last point of the previous line.  It then creates the new line as you wish.

  I tried to use a loop with group a cluster for the chart, but the chart resets the plot at each iteration (as expected) and I can't find a way to maintain the previous data.  I tried using shift registers, but was unable to find a way to do it, and I tried also the cluster of a painting company, but can not find a way to make the cluster to a 1 d of a cluster of 2 elements array.

  One option is to have is to find a way to maintain the previous data, but the preferred option is to create a new path to each iteration to see the color change for each new parcel.

  I take stabbed it because I don't know exactly what you want. But I think that's what I've shown here. You must use a shift on your outside register while loop, as I showed. Your image where you tried to use a shift register shows a misunderstanding of the shift registers and how well they work, then I'd take a peek at these tutorials.

  

• How to control a VI (with a while loop and a structure of the event) from an another VI

  Hello

  I have the main VI which I want to be driven from an another VI. But I can't do that and I don't know what is happening.

  For example: VI main, I have a while loop with a structure of the event, there is a Boolean controller controlling a Boolean LED, which is inside the structure of the event. And the other VI, there is just a Boolean controller and functions of applications to open the main VI.

  How can I control the Boolean LED in VI main, changing the State of the Boolean controller in an another VI?

  Thank you.

  There are different options, but depending on what you want to do. For this example I can't give you a specific solution.

  I do not understand why you do what you do. Why do you call your 'principle VI' dynamically? What is the advantage to do? There are also other ways to call a VI dynamically, based on real cases (for example the method "call and forget", etc...).

  In you principle VI, control you Boolean ("THATCHER") is not the case of corresponding event. This is not usually a good practice, keep it inside.

  Also, why you try to communicate with the caller and callee VI through such a way to twist? There are better ways to do it.

  In one of my projects, I use the user event to launch orders in case of case of appellant VI.

  some Associates more readings for you:

  http://www.notatamelion.com/2015/03/23/how-to-make-dynamic-subvis/

  http://forums.NI.com/T5/LabVIEW/Dr-Damien-s-development-event-structures-III-communicating-with/m-p/...

• How to increase the resolution of the timer loop?

  Hi all

  I use myRIO 1900 for my project of Active noise cancellation. I need to process the audio signal @44. rate of 1 kHz sampling and 50 samples per image. So, I use myRIO personality of broadband.

  Now my problem is simple, I want to measure the time each iteration (loop). I went for the number of cycles normal (msec). Used as a standard [https://decibel.ni.com/content/docs/DOC-11078].

  But my value of the indicator oscillates between 1 and 2. It is supposed to be 1.13msec, but how to find the exact value of timer?

  I think, I can't increase the resolution of tick count (msec) as it is by default is 1 ms resolution and I can't use the clock source external I use myRIO.

  Help me calculate the precise time of loop.

  Thank you.

  RT has express VIs for timers.  You can use this: http://zone.ni.com/reference/en-XX/help/371361J-01/lvexpress/tick_count/

• How to increase a number 1 in a loop

  Hi This is slightly more difficult that the title reads I think.

  I have some time the com port to detect a switch being turned on or off by a looping rs232 loopback

  If I get an error of judgement, no error on.

  I want to do is multiply by 1 when the switch is in the off position, but for the moment

  just constantly increase as the function '+ 1' is in a loop.  How can I do more

  the number of times.

  The loop should run continuously if the switch is on or off

  I hope this makes sense, I have attached a picture of what he does now

  I look forward to your suggestions.

  One way is to use a flag.  I have change the true flag as soon as the thing turns on, then wrong again until the next time it is turned on.

  There may be better solutions, but this is the first thing that comes to mind.

  EDIT: My example is what said Cristian.  Beat me to it.

• How to increase the volume on a DVD, play using Windows Media Player?

  Original title: speak low volume problem

  Remember - this is a public forum so never post private information such as numbers of mail or telephone!

  Ideas: How can I increase volume on a dvd in windows media player?

  • You have problems with programs
  • Error messages
  • Recent changes to your computer
  • What you have already tried to solve the problem

  Hi onesigvector,

  Try the following steps to increase the volume on Windows Media Player for playback of the DVD.
  Step 1: Change volume settings in Windows Media Player
  a. see change volume in Windows Media Player settings

  Step 2: Set the mixer for the player
  a. open Windows Media Player.
  b. click the present volume on the taskbar icon.
  c. click Mixer, under Applications, move the volume for Windows Media Player.
  d. close the volume mixer window and check the result.

  Visit our Microsoft answers feedback Forum and let us know what you think.

• How to send the value of inside while loop outside

  Hello

  The goal of my project is to control the height of a ball in a tube (there is a fan down low to lift the ball to the top and bottom) and a Top ultrasound sensor read the distance of the ball.

  I am currently using a PWM signal to control the speed of the fans (which works fine) and I use the VISA blocks read/write to communicate to my sensors (which works also very well - I can get the distance to the ball - when I move the ball up and down changing the duty cycle).

  My problem:

  Now, to create a control problem, I need read the distance of the ball, have some sort of controller and feed in this output as my new duty cycle for the fans... However, I need loops I have (running fans and continuous sensors to run (I guess? unless there is a way around it.) so the fans continue to work and sensors keep reading.) I need to get the measure of the distance of the loop of the sensor (after its been read) passed out of the loop and to be updated of course - then calculations can be made on that and then can be used as my duty.

  Someone in a way that I can do this? Its all tied to your reference, version of labview 8.6.

  Thanks heaps!

  Nick.

  
  

• How to reinstall windows xp service Pack3, while I use the disc no. SP?

  I found a real problem with .net framework which needs to reinstall windows xp. But I found a problem with reinstalling too. When I restart the system and boot on the CD it only reboot the system which is installed! And I don't want to install a new session of xp. Can you help me?

  Viktor,
  PS Sorry for my English

  Hi Victor,

  There are a few options here: http://social.technet.microsoft.com/Forums/en-GB/w7itproinstall/thread/e30d920f-ddd9-42a0-9357-ff2b67c9e221 and here: http://social.microsoft.com/Forums/en/whsvailbeta/thread/af946ffc-9eb5-4b82-b4c0-5844d176a661 that can help

• get the structure of the event inside the while loop to wait for event occurs before the execution

  Hello

  I have a small problem, when I raise an event using a value change button, which works very well.  The problem is that the VI does not wait for me raise an event and instead runs the same event again, even if I have not pressed the button to start again.  The mechanical action of the button switch is released is.

  I was wondering how you get the structure of the event to wait for a user event, after that he executed the first time.

  James.Morris wrote:

  There is no reason that the event should be raised twice as much that the only way that it fires in your code is by the user by clicking on 'Hall measure only'.

  Oh yes, there is, and I deserve a kudo for this one.  Mechanical action on the button is set on the switch until published, so click to generate an event, on the bottom and on the square, attached is an example.

  My boy has my students hate this question, and to be honest, I hated it.  When never would you do that intentionally?  Honestly?  Anyway to change the button back to normal (as default latch when released) and move the terminal button in the structure of the event where it is managed and it will work as usual.

• How can we enter and update digital panel forward when a young while loop runs?

  Hi all

  In my code, I have a while loop making quick gripping (sampling)

  How can I update other digital controls in the front panel when the while loop runs?

  right now, once I have enter a number in this digital control, the computer seems to be no answer to the elbow. Looks like the computer focuses on the while loop.

  any ideas are appreciated.

  Thank you

  Jack

  
  

• How to increase/decrease the speed of Mp3 playback?

  How to increase/decrease playback speed Mp3 while reading an Audio file in Flash? I couldn't find an option like that in class GreenSock Mp3Loader as well.

  Any ideas please?

  Try these:

  http://www.leebrimelow.com/playing-an-MP3-in-reverse/

  First steps with flash 10 audio programming | kelvinluck.com

  The first seems to be a lot simpler.

  Hope this helps