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AMP 2 alsa settings

Hi I am running dietpi and set my amp 2 as dac+ as is recommended but setting  but I cant set the amixer as it says in the instructions on your site

amixer sset PCM 90% gives an error amixer: Unable to find simple control 'PCM',0

In alsamixer I see a digital analogue and whole lot of other settings.

aplay -L output gives this:

Discard all samples (playback) or generate zero samples (capture)
card0
sysdefault:CARD=sndrpihifiberry
snd_rpi_hifiberry_dacplus,
Default Audio Device
dmix:CARD=sndrpihifiberry,DEV=0
snd_rpi_hifiberry_dacplus,
Direct sample mixing device
dsnoop:CARD=sndrpihifiberry,DEV=0
snd_rpi_hifiberry_dacplus,
Direct sample snooping device
hw:CARD=sndrpihifiberry,DEV=0
snd_rpi_hifiberry_dacplus,
Direct hardware device without any conversions
plughw:CARD=sndrpihifiberry,DEV=0
snd_rpi_hifiberry_dacplus,
Hardware device with all software conversions

 

any help appreciated.

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