Well hot damn! Well folks that what many of us get for assuming things (me included)...

Page 38 of the Prelude Manual is about "Editing a tone/Editing a tone in detail".

I can't understand why Roland didn't post that about the Prelude. That's a big feature IMO when looking at the budget line.
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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.