Hi I have an original Roon Nucleus, my system uses a Bonn N8 switch also using a Sonore opticalRendu and a Mytek Brooklyn Dac+. I use a Samsung tablet with the Roon app.
I few days ago I had a quick power outage at my home. Well now I can longer control the music volume from my Roon app it is staying in the fixed position on the app no matter what I do.
If you look at the photos under the Mytek I have tried both fixed and device volume, neither allows the Roon app to control the volume it always shows fixed no matter what I do.
I even reinstalled the app on my tablet, still the same. Any suggestion would help as want to get back to controlling the volume via the app.
I did a backup as well as delete all the endpoint files in my Roon/Database/Registry/Core. However the issue of Roon staying in the fixed volume position persists.
This has so far been difficult for our team to replicate internally, which suggests the sudden power loss might be a factor. From the read of it, the outage left the Brooklyn DAC+'s internal volume register in an indeterminate state. When it came back up, the value it initialized to no longer matched what Roon had cached as the last-known volume position. The two sides are now in disagreement: Roon renders the slider where it thinks volume is, the DAC isn’t responding to changes in the expected way, and the UI appears stuck.
Renegotiating device discovery doesn’t seem to have resolved this, so let’s try a few more heavy-handed steps (if you haven’t already).
First, try a full cold reboot of the Brooklyn. Not standby/wake, but a full power-off with enough time for the unit to completely discharge (30-60 seconds should be sufficient). This should allow the DAC’s firmware a clean path to reinitialize that register correctly. Once it’s back up, check whether volume control has been restored. I
Please also try to manipulate the physical volume control on the Mytek.
We’ll watch for your response and proceed from there. Thank you.
I appreciate your follow-up. I did try the cold start of the Mytek Dac as you suggested. Sadly no luck. Then for the heck of it I asked Chatgpt. Here is what it replied, which did reset Roon to allow me to have volume control. The only issue now is the output of the volume is low. Please review the following.
From a fresh Roon Server diagnostic report, we can see that before the power outage:
The opticalRendu was reporting volume as software dB type (“type”:“db”, range -80 to 0 dB). It connected, initialized at 0 dB, and Roon immediately sent update_volume: -69 meaning you were listening at a relatively attenuated level, with the full 0 dB headroom available.
After the power outage:
The opticalRendu is now reporting volume as ALSA hardware type (“type”:“number”, range 0 to 100). The volume is being set around 20–26 on a 0–100 scale. On this scale, 20–25 is genuinely low, roughly 20–25% of the ALSA USB mixer’s maximum. This is the “USB Mixer” on the Brooklyn DAC+, which is a hardware control, not software dB gain.
The power outage likely corrupted or reset the opticalRendu’s configuration. It switched from using Roon’s software volume (dB) to using the ALSA USB hardware mixer on the Brooklyn DAC+. These behave very differently, the ALSA mixer at value 22 out of 100 is genuinely quiet, whereas the old software volume at -66 dB out of 0 dB was a deliberate attenuation that you could increase.
The opticalRendu’s SonicOrbiter software should control what volume type it advertises to Roon. Log in to the opticalRendu web interface (its IP is 192.168.254.148) and check the audio settings. Is there any option for volume control?
If so, set it to software volume rather than hardware/ALSA volume. This will restore the dB-based control Roon was using before.
It looks like you already have device volume set in Roon, so thats good.
Feel free to show a signal path screenshot after the above if you’re still having issues.
