asterisk users - Sep 2011 - Increasing the fxorxgain and fxotxgain for the hardware of the digium card

Hi All;

In the zaptel, we were increasing the gain of the voice volume at the hardware
level from the /etc/zaptel and /etc/modprob.conf files, but now we are using
DAHDI, so where to do the same thing?

I am looking actually to increase the volume at hardware level and not software
to avoid the DTMF detection problem and to have better voice quality.

Any advise?
Regards
Bilal