After updating, the problem remains.
Load a 120 bpm track into deck 1.
Load track 124 bpm into deck 2.
Progressive house tracks, as an example.
Turn on Crossfade FX
Turn on Tempo Blend
Turn on Sync
…
Press Play on deck 1
After 2-4 bars, press play on deck 2
BPM 120 on deck 1
BPM 120 on deck 2 and percentage (-2.4%)
…
Move the crossfade to the side of deck 2.
Note that as soon as you start moving it, you will see a percentage of 0.0% on deck 1, at which point the sound may become distorted.
Move the crossfade further up to 0.2 - 0.3%. You’ll be able to hear the distortion too.
I noticed that as soon as synchronization is turned on and the crossfade is moved, we get distortion at the initial stage from 0.0 to 0.5% approximately.
Disable Crossfade FX and this problem will disappear.
The problem is that when we turn on Crossfade FX and Tempo Blend, Key Sync is turned on.
I think that because the program is trying to preserve the tone of the track during mixing we have such distortions.
I checked it on iPhone 12 Pro with and without Mixtour Pro controller - the error is the same.
I was playing in nightclubs of 500-1000 people and it was very frustrating. I had to turn off the effects to make the transition from one track to the next smooth.