How to select the Mixer output?
Volumio allows to select the best mixer preference according to your audio chain.
Go to SETTINGS menu
Go to PLAYBACK OPTIONS menu
Here, you have 3 mixer choices:
Software: mixer algorithm is demanded to Volumio OS
Hardware: mixer algorithm is demanded to the streamer board (suggested if you are using Volumio Primo without external DAC)
None: mixer algorithm is demanded to an external DAC/AMP