I use GoneMad music player, no issues running V4a. No need to disable or modify anything. I've run 4.1, 4.2 and 4.3 ROM's with that combo with no issues whatsoever
Well you do need to disable GMMP's DSP and enable "Use external DSP" just to be on the safe side.
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Really? I've never done that and it always works like a charm.
I've tried them all. Still prefer GoneMad music player. Lots of features other players lack