The OD sounds, to my ears, sort of 70s fusion-ish (think the Crusaders), at least thru my little Randall tube amp (which is an early 80s model itself).
I used it in a bass rig consisting of a Carvin 300w head and Fender 1x15 cab, and it really added. Now I have a Hartke rig that gives me everything I want, so I'm selling the preamp.
FYI - a surprising amount of interest in this little unit, so don't be shy, boys - bid it up! 
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"I just play any old go-to-hell note that swings." - Pops Foster
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