I just saw your response…
I’m using the Sonore UPnP Bridge app (which uses Roon’s SqueezeLite support) on the ultraRendu, not the Roon Ready app. I assume that the Roon Ready app can only be used when the Rendu is directly connected to a USB DAC.
By the way, per further testing, I’ve found that the UnitiQute2 volume jumps to max whenever I do any of the following:
- Restart ‘Roon Server Software’ from the ROCK admin page.
- Reboot the device that hosts ROCK (a NUC in my case).
- Save Audio settings from the Roon control app.
- Save Sonore UPnP Bridge app settings from the ultraRendu admin page.
However, I just found a solution. As mentioned in the original post, I’ve been using ‘Fixed Volume’ in the Roon Audio Device Setup settings until now. I changed it to ‘Device Volume’ and the jumping to max volume problem is no longer happening.
I had originally configured ‘Fixed Volume’ as I wanted to be absolutely sure that I was using Roon in bit perfect mode. However, I now realize that the Roon Volume Control mechanism is not via DSP, but rather utilizes bidirectional volume commands that are passed between Roon and the audio device. I’m pretty certain that this is true, as the DSP Engine remains disabled. Is that correct?
By the way, I jjust found this and read about the volume control options: https://kb.roonlabs.com/Audio_Setup_Basics
it seems dangerous to me, that when in ‘Fixed Volume’ mode, Roon sends a ‘set volume to 100%’ command to the audio device on start up.
Perhaps there needs to be a ‘% Volume’ setting (that defaults to 0%, not 100% !) that goes along with Fixed Volume mode?
Or there should be another choice: ‘None’, which obviously would not send any volume control commands to the device, even if that device indicates that it has volume control capability.
Fortunately I escaped without blown speakers, but that is surely going to happen to someone, if it hasn’t already.