Volume hot keys: How can I configure the number of volume-steps on Debian?

I have a good DAC and a strong amplifier. I use Debian and sometimes I just can't get the volume gain to be as I wish to using the hot keys. I've noticed that each time I hit them, the volume increases or decreases 6%.

How can I change this percentage to say 1% ?

this solution is not possible on Debian.

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