[quote name='EBS_freak' timestamp='1503590354' post='3359487']
If you aren't using phantom, standard XLR splitters will do you. If you are using phantom, you'll need isolated splitters.
[/quote]
Isolated splits also help avoid hums and other unpleasantness - but if it's your own gig I definitely give it a punt with simple splitters first.
The more I think about it, the more I seem to remember someone like Zoom putting out a sort of in-line 8 track device a year or two ago - I think the idea was that you placed it between the instruments and the desk, hit record and it recorded directly to as SD card.
btw - don't forget to budget for a pair of mics (and a way of mounting them) to capture the rapturous audience response...