-vol parameter is confusing me.
256 => normal (i guess meaning same as input volume, no change) 512 => (double the volume - read this somewhere).
So what to do for 3 times the volume? 1.5 times the volume?
Basically, lets say I have the max sound amplitudes (audacity levels) in 3 files as:
0.8 0.6 0.9
I want to amplify in the first two files, so that
max=0.9 in all files. What parameters of
-vol I would use?