lowpass.comp: man page help for setting gain pin
lowpass.comp: man page help for setting gain pin

i couldn't figure out how to show the more complicated
equations but this may help users wanting a starting
point for setting the 'gain' pin

Signed-off-by: Dewey Garrett <546ec366615570e68497e3c5df9092106a9808f4@panix.com>

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