[SoX-users] sinc band reject filter with low volume files

[Jan N. <re...@gm...>]

Hi all,

because of my tinitus, i like to convert my mp3 library with a band 
reject filter from 6000Hz to 8000Hz.

i  use this commad line:

     sox input.mp3 output.mp3 sinc -p 100 8000-6000


If the input file is loud enought, then it works very well and the 
expected result is the right one.
But if the input file is not loud enought, then sox reject the frequncy 
range to -90db  - i like to have at least 15-20% of the original volume 
in the rejected frequency.
Without the -p parameter, it is the same effect on high volume files, 
that everything in the rejected frequncy range will be cut off.
How can i do that?

Jan