Strange Pitch Error while Recording Dj-Mix with Xone PX5

Audacity Help Forum Windows
1

Hey Everybody,

I just recorded a Dj Mix at home and did record the whole mix in Audacity.


After 2 Hours and 3 minutes the Speed increases in the recording…
After 2 Hours and 56 min the Speed got back to normal

In this period the recording sounds distorted as well.

Before and after that pitch change the recording sounds perfect.

I do not remeber touching the Laptop in that time, luckily I was recording the set parallel with a tascam dr40 on Record-Out on my Mixer, so i have a working Mixfile, but i wonder what was the reason anyways.

Just saw that there is a newer version of audacity online, i will Update now from 2.2 to 2.4 and try again maybe another day.

Attached you see the waveform of the distorted time Area and a Soundfile which shows the beginning and the end of that strange behavior.

I´m thankful for any suggestions.

best regards
Richarde

Soundfile Waveform.png

2

So I was thinking that perhaps the sample rate somehow got bumped around…

I measured and found that the before the jump, the rate was about 122 BPM, then right after the speed increase it went to 146 BPM, a ratio of 5:6. The 44100Hz to 48000 Hz is more like 10:11, so it does NOT look like this is what happened.

I am not sure I would want to hazard a guess as to what might cause this. Do you think it could be the USB interface on your mixer?

3

Thanks for analyzing and taking time for this.

As it was the first time i used the soundinterface of the mixer and audacity for recording it could come from everywhere.

I was hoping someone could tell by the behaviour “ah, that´s this and that, i used to have the same Problem”… :slight_smile:

I´m still hoping for this user and will meanwhile keep updates posted here.

ths Richarde