First - are you using the SD40 for rhythms, and patterns, or just to trigger harmonies? If you are - I suggest that pianist mode is probably best, as you have limited keys for live playing on a 49 not e keyboard.
Try each preset to see which one suite you, and then tweak it to compliment your voice. Make a few presets. I like one that features my lead voice, and the harmonies compliment it, but if your 5 pc group, you may want to make a "doo wop" band preset that has your voice as an equal part of an ensemble sound that can ohhh and ahhh behind your lead vocalist. This is SO much fun.
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