I think I would look for a player that allowed you to store a volume offset and maybe EQ preset with each file... It's tough to make sure that all your .wav's are exactly the same volume and EQ balance when you make them. Being able to adjust them on the gig, and then store that adjustment would strike me as a primary need for the live player...

Will VanBasco do this?
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An arranger is just a tool. What matters is what you build with it..!