1.    29 Dec 2016 #1
    Join Date : Dec 2016
    Posts : 2
    Windows 10

    Laptop makes speed of audio recordings fluctuate

    I was recording a duet for a song I had recently arranged for piano, and everything went well until I tried to sync the two parts I had recorded. When I put it into a video editing software, one of the two parts would sometimes be ahead of the other one, and sometimes behind. I checked the two parts against a metronome, and realized that although I had initially recorded the two parts with a metronome, the audio recorded by my laptop would slow down and speed up at random intervals. To further test this, I recorded a metronome ticking at 100 bpm, and played the recording on my laptop with the same metronome ticking the same bpm beside it. Turns out that my laptop skews the speed of recorded audio! Although it doesn't mess up the speed too much, a difference of half a millisecond between two duet parts makes my song sound like a drunk man banging on a piano. Have all my hours of work gone to waste, or do I still have hope?
      My ComputerSystem Spec
  2.    29 Dec 2016 #2
    Join Date : Dec 2016
    Posts : 20
    Windows 10 Professional

    It's possible the laptop had lagged when recording and recorded the notes at slightly incorrect intervals as it was thinking more at certain points than others. This is potentially fixable in the software (was the audio recorded to a MIDI file? or just an audio codec like mp3). It's also possible that the video editor is playing back in a lagged manner.
      My ComputerSystem Spec
  3.    29 Dec 2016 #3
    Join Date : Dec 2016
    Posts : 2
    Windows 10
    Thread Starter

    My laptop seems to record wrong every time, though. As I mentioned, I did several tests, and the audio came out wonky every time. Could it be possible that it is because it was a video (mp4) file?
      My ComputerSystem Spec
  4.    29 Dec 2016 #4
    Join Date : Oct 2013
    A Finnish expat in Germany
    Posts : 13,126
    Windows 10 Pro

    You could try a program specifically intended for recording audio. I use CyberLink's Audio Director 7, available as standalone product or part of CyberLink's Director Suite:

    Click image for larger version. 

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    A trial version is also available.

    As it happens, Shareware On Sale has the previous version Audio Director 6 available for free today. Checking the offer just now it's still there, offer ends in about 8 and a half hours at 8 AM Friday UTC, 9 AM Friday CET, 3 AM EST, midnight PST: Free CyberLink AudioDirector 6 (100% discount) - SharewareOnSale

    Notice that the Shareware On Sale free version is the Lite Edition, somewhat stripped down.

      My ComputerSystem Spec
  5.    29 Dec 2016 #5
    Join Date : Aug 2014
    Australia, Adelaide
    Posts : 1,570
    W7 Ultimate SP1 (64 bit), LM 18.2 MATE (64 bit), W10 Home (64 bit)

    W10 constantly "thrashes" the CPU on my real and virtual setups (Apps?, Data Mining?, Telemetry?).
    It's possible the thrashing is causing the delays.

    You could try:
    • Closing/disabling/suspending any other running software
    • Increasing the Priority of the recording software
      My ComputerSystem Spec
  6.    29 Dec 2016 #6
    Join Date : Aug 2014
    Forever West
    Posts : 3,986
    Win10 Home and Pro, Win10 Insider Preview, Win7 Home, Linux Mint


    Suggestion: Look at Kari's My System Specs and fill in yours, might help provide more insight to the problem. Also check his solution for cooling of a Notebook/Laptop, any additional cooling can cause better stabilization.
      My ComputerSystem Spec
  7.    31 Dec 2016 #7
    Join Date : Aug 2015
    Posts : 31
    windows 10

    I've had a used laptop that would do that, just the slowing down part. Made me give up a lot of work writing a program to record pen strokes. If all fails, get an external USB sound card see if it helps.
      My ComputerSystem Spec


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