asterisk users - Feb 2008 - adjusting volume on a wildcard 100XP with zaptel's {t, r}xgain

I'm finding the volume of the calls on my wildcard 100XP (clone) is too
low.  I understand I can muck with rxgain and/or txgain (which one in
fact will increase the volume of the other party as far as I'm hearing
it?) to deal with this but right now I have them both at 0.00 and I am
concerned about introducing echo by fiddling with them given that these
two registers are what are fiddled with to deal with echo problems too.

How can I safely adjust these?  Caller report low volume problems from
me too, so if I make equal adjustments to both will that maintain my
level of (non-)echo?

Thanx,
b.

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