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Re: Crackling sound when changing Slowdown slider in Playback Control

From: Lib Lists
Subject: Re: Crackling sound when changing Slowdown slider in Playback Control
Date: Sat, 30 Oct 2021 20:37:44 +0300

On Sat, 30 Oct 2021 at 19:53, Richard Shann <> wrote:
> On Sat, 2021-10-30 at 19:18 +0300, Lib Lists wrote:
> > Hi,
> > (Listen to the attached .mp3) When I change the Slowdown value in the
> > Playback Control (in this case to 1,2) I get this crackling sound. At
> > speed = 1 everything works fine. I thought the slider would change
> > the
> > BPM but it seems it tries to stretch the audio in real-time, am I
> > right?
> Yes, to change the BPM you use the button at the other end of the line
> where the BPM is given.
> The slowdown slider does real-time slowdown of the audio output, so
> everything, the attack, the decay all is slowed down. The quality isn't
> as good as when not slowed down but it doesn't have the type of
> distortion in your example. I take it you haven't got the volume too
> high? I was thinking it may just be a question of raw computing power,
> but I just tested it on a dual core 1.5GHz Asus laptop under Windows
> and it worked fine. That machine takes an age to typeset or do anything
> much.

No, the volume is not too high. However, I'm using Linux under
VirtualBox and I'm wondering if that could be the cause of this

> Anyone else tried the slowdown feature? (It's really for people
> transcribing from audio source - you load the audio and then it's handy
> to slow it down sometimes as you transcribe).
> Richard

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