Paul - thanks for the reply but that doesn't seem to work for me. I
tried with the following command,
sudo alsamixer -D equal
It displays the equaliser bands but the labels are in the 0-99 range
with the default values showing as 66.
I wonder if I've stumbled across the answer on this page -
I've enabled the equaliser option and it's working, but can someone
please explain what adjustment units it uses? I want to try out some
headphone equaliser settings that use the common frequency band decibel
gain values, e.g. +3.0 dB or -2.2 dB, but the adjustment values in the
equaliser range
