I've not got an XLR out from my little amp, just a 1/4 jack. The GK has one, but I'm not using that this time. I've got one on my tuner though, which has a 0, -10 and -20 db switch, would that be safer to use?
Even just having a cursory Google throws up all sorts of weird things that look shiny but I have no idea whether any of it is any good or not. I'm very definitely in the shallow end of this very big pool
I'm going to suggest that if the singer wants the speakers to hear himself then that's fine but we'll get a recorder like the H4n instead of the M-Audio thing and carve the soundfile up on a PC afterwards.