section "The amplify filter"
option "amp" a
"amplification value"
int typestr="number"
default="32"
optional
details="
The amplification value determines the scaling factor by
which the amplitude of the audio stream is multiplied. The
formula for the scaling factor is
factor = 1 + amp / 64
amp value scaling factor
~~~~~~~~~ ~~~~~~~~~~~~~~
0 1
32 1.5
64 2
128 3
"