The PSR-S550 will do this for sure. It has a style creator that lets you edit the styles. You can take an existing file, make some changes such as revoicing, adding to the drum track, and so on. You can also create a style from scratch. You can load in styles and tweek those as well.
I've played the E-413 and nowhere do I remember seeing on that unit the ability to revoice a track (I could be wrong), but from what remember it's very limited in style editing.
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.