I'm tracking an acoustic guitar today, it's a driving part, heavy strumming (think Bob Seger's "Night Moves" style).

Which is best-or is it situationally dependent?

Why?

Have at 'er.
K.

I need to isolate lows, mediums and highs of an audio file, each on a separate track.
(It is intentional to separate these bands from the source)

High Pass Filter - A filter that attenuates frequencies below a certain cutoff point, while passing on frequencies above the cutoff unaffected. Sometimes referred to as low-cut filter.
(See Filter)

I want to record some music in the band I am in, but I want to get as good of a sound out of the recorder as I can. The band consists of 1 singer, 2 guitarists, 1 bassist, and 1 drummer. The recording device I use is an Alesis Multimix 16 USB 2.0. The mixer as a 3 band EQ and does high pass filtering at 75 hz.