Can't set volume with amixer

I tried to set the volume of my Hifiberry Amp2 using the command line.

I read a lot but couldn't figure out why it doesn't work. Am I the only person having this problem?

When I do:

amixer scontrols

it just lists:

Simple mixer control 'Master', 0
 Simple mixer control 'Capture', 0. 

I am searching for

Simple mixer control 'PCM or Digital',0

Can any body help?

Thanks in advance and best regards


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