Creating right softvol entry for mini amp

Hello i'am using the MiniAMP with the Raspberry PI Zero WH and like this combination very much. Mini Amp is an awesome small amplifier!

Everything works fine, but i have realized is the missing hardware mixer for controling the volume comparing to the amp2. I want to adjust the volume.

I have searched several sources on google and also this forum and the solution is using the alsa softvol-plugin but how? Here is my /etc/asound.conf :

pcm.!default {
type hw card 0

pcm.hifiberry {
type softvol
slave.pcm "plughw:0"
control.name "Master"
control.card 0

Now i have a mixer in alsamixer but it seems not to change the volume.

Can someone give me a hint how to have a working softvol muxer with the amp mini ?

My aplay -l looks like this:

**** List of PLAYBACK Hardware Devices ****
card 0: sndrpihifiberry [snd_rpi_hifiberry_dac], device 0: HifiBerry DAC HiFi pcm5102a-hifi-0 [HifiBerry DAC HiFi pcm5102a-hifi-0]
Subdevices: 0/1
Subdevice #0: subdevice #0

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