I've been using compressor on bass since last April and really like what it does for my sound. It evens things out and by doing so increases the apparent volume. I imagine it'll do the same for guitar, but the most apprent effect will likely be increased sustain. You'll have to experiment to avoid an overly squashed sound, though -- unless that'swhat you're looking for. IfI had to guess, I'd say that Steely Dan's guitar solos are heavily compressed.
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Dave Molter, MGR Managing Editor/Bass Guitars Editor
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"Bass is the foundation of the band." -- William Murderface, Dethklok bassist
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Lakland 55-94; Hofner Icon; Kala U-Bass acoustic & solidbody; Stagg EUB; Genz-Genz Shuttle 6.0; Line 6 Lowdown Studio 110