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SPL for live shows?

I've been drafted to do the sound for a few live gigs of a band I've been working with in the studio. I have nearly no experience or training with live sound.

I've got a few questions to that extent.

1. What SPL should I be aiming at? I know that 97dB is safe for 30 minutes at a time, which is the approximate legnth of a set they're doing.

Multiple audio outputs of live backing track with video

I need to be flexible in my live show setup, so that I can have different mixes for various shows. So I'm thinking a piece of gear with multiple outputs like a digital mulitracker or ADAT would be cool.Some shows will need a full mix, others will need guitar, bass or drums muted, so that I can occasionally have a live guitarist, bassist, drumer, etc. I need to be flexible in my line-up.