Thanks for the replies, lots of useful info.
It's a small gig, no more than 50 people in a sports club function room and we are the only band. There is no sound engineer! It'll be me reluctantly doing that job! We will be using all our own PA kit which includes a pair of 15" powered speakers for FOH, 4, 10" wedges and a small mixer. The guitarist are using combo amps.
I'd like to get the guitars into the mixer as well as the bass/vocals but the guitar amps have no line outputs and the mixer has no spare mic inputs (and we don't have spare mics either!)
On bass I can usually hear the guitars but the drummer can't and he gets lost sometimes (often) when he misses ques that come from the guitar parts.
I was expecting it to be harder to hear when the room is full of people.
Hmmm
--Ian