I am trying to use the ALSA version of Stereo Tool as a system-wide DSP. It supports only ALSA and nothing else.
Basically I have to route the system’s pulseaudio output - to the program via ALSA. Then the program itself will handle the output to the hardware alsa device.
I have created a virtual audio sink in pulseaudio using “pacmd load-module module-null-sink”, and with that an ALSA device called “Loopback:PCM0 (HW2,0) ALSA” appeared, but there is no sound through it.
How do I “join” the pulseaudio virtual sink to the ALSA fake loopback deice?