Increasing sound volume with amixer

Hi,
I know, I can set the sound volume with something like this:
> amixer set Master 10
But is it also possible to relattivly set the sound? Can I somehow in example increase the volume by 10%?
I want to set keyboard shortcuts for turning volume up and down!
Thanks!
Nathan

Read "man amixer":
set or sset <SCONTROL> <PARAMETER> ...
Sets the simple mixer control contents. The parameter can be the
volume either as a percentage from 0% to 100% with % suffix, a
dB gain with dB suffix (like -12.5dB), or an exact hardware
value. The dB gain can be used only for the mixer elements with
available dB information. When plus(+) or minus(-) letter is
appended after volume value, the volume is incremented or decre-
mented from the current value, respectively.
For keyboard shortcuts, use e.g. xbindkeys or xhotkeys or keytouch.

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Increasing sound volume with amixer

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