HifiBerry DAC+ (amp2) with the most recent roon-1.8.img starts with max. volume (awaking everyone) and when desperately trying the Roon app on an iPhone to reduce the volume has no effect (using the slider) so cutting the power to the raspi was the necessary but least elegant option left. Using a remote SSH session with Alsamixer (playback, digital) does the job.
Changing the SD card and using an older backup SD Card with HifiBerry Roon Client 1.0.6 lets the roon app perfectly change the volume. What am I missing with the 1.8 version settings?
Can you give some hints?