It's time for Buster RC-2. Testers Needed!

If of interest, I tried to install https://os.zynthian.org/2020-05-22-zynthianos-buster-lite-1.0.0.zip on official Kit V2. Initial boot showed error screen with IP adress. Webconf not working, but could ssh into zynthian. Then did update_zynthian.sh. webconf now working, zynthian boots regularly.
Then I tried to activate pianoteq stage, uploaded the pianoteq 7z binary. In the webconf screen, I tried to enter my license key, but got the error message (in webconf browser output): Pianoteq Action Failed: Command ‘/zynthian/zynthian-sw/pianoteq6/pianoteq --activate MY-LICENSE’ returned non-zero exit status 2. (I replaced actual license key for reporting). So I remembered the old way of activating: start pianoteq layer with a running ssh -X connection to zynthian. Then a window of pianoteq gui appears on the computer where activation info can be entered. So far, everything works fine.
But have mixer settings / audio been changed? Whenever I play some key, there is an accompanying noise that then fades out. Seems like the audio channel is opened (noisy) when active and then muted again. Tried to record the effect with zynthians audio recorder, and the effect is there when played back on the zynthian. But too low volume when played back on the computer so I cannot really demonstrate it. But it’s not the auto mute feature (which is turned off). It’s different. noise is of constant level, and it affects any engine.
I have hifiberry dac+adc.

–> edit: regarding the noise, I’ll try to investigate this: A weird noise is driving me mad [SOLVED]
My hardware hasn’t changed and the noise wasn’t there with previous official 2019-09-24-zynthianos-buster-lite-1.0.0-RC1.zip