"N_Cook" wrote in message news:mp2ei9$mqk$1...@dont-email.me...
Yes, a mono jack into the Insert socket will produce no sound whatsoever, it
is not an input socket.
However, if you plug a mono jack in part way, so the plug tip makes contact
with the socket's ring connector, you CAN often inject a signal into the
channel.
However, this part of the circuitry is at line level, so a guitar is very
unlikely to have enough output for this method to be useful.
You'd stand a better chance using the proper line input socket and the gain
control, or possibly the Mic amp with a suitable adaptor cable, or better
still use a DI box, that's what they are for.
Interestingly, the Power Amp Insert sockets are wired the other way - tip is
return and ring is send - so plugging a mono jack in these WILL overide the
mixers output and make sound.
Gareth.