Understanding volume setting with CamillaDSP

[scaronpce]

Hello Forum,

I am trying to get my head around the volume information displayed in moOde when playing audio using CamillaDSP.

For example:

Code:

Volume typeCamillaDSP (64-bit), Range 70 dB
Volume levelsKnob 80, ALSA 0.00dB, CDSP -14dB

I can see that the Knob Position (KP), Volume Range (VR), and volume level are related: -(100-KP)*VRdB/100 is -14dB
(This formula is not valid for very low knob positions but I am only interested in redondance here. It is valid for all volume ranges from 30dB to 80dB.)

Changing the Audio ALSA Options Max Volume value from 100 to 80 changes the current ALSA volume to 94% (according to moOde GUI) but yields:

Code:

Volume typeCamillaDSP (64-bit), Range 70 dB
Volume levelsKnob 80, ALSA -6.00dB, CDSP -14dB

My (limited) understanding is that a -6dB drop is a 50% drop in amplitude (10^(-6/20) = 50%).

How can I relate the change in Max Volume value and the resulting ALSA dB value ?

Regards,

PS: Thanks to every contributors that produced docs/moode_audio_infrastructure.md at main · moode-player/docs · GitHub.