I have already answered by e-mail (topic is "[External] Cracking sound artifacts (OpenSL ES) (Pico Neo 3)").
Here is a copy:
PUI version is 4.5.30 (Neo 3 Pro).
I tried to make a video capture to show a problem, but it has no sound at all, is there a way to record a screen with a sound?
(Additional information: just noticed that "cracking" sound only appear on internal speakers. With the the headphones connected I couldn't reproduce the problem.)
Tried different background music, problem reproduces even for simple sine wave. The lower the wave amplitude, the more quiet are the cracks.
Also, problem reproduces on other apps too. Open Firefox Reality, open Boxing demo (https://webvr.soundboxing.co/) and start "Close to me" song (button at top-left corner). Start VR mode, move controllers away so you will miss any rounds and hear lots of "miss" beeping sounds. If system volume is around 60-70% you will hear the cracks on almost any miss. Other songs also cause same artifacts but, probably, on different volume levels and sometimes they are hard to catch.