Moin,
What You want to achieve may be possible if programmed accordingly. Maybe You will need some programs with the same sound, but different routing to A/B outputs.
In general You will achieve Your goal with external equipment (mixer, different signal paths) only, but will have to switch more than Your P08 for another sound/patch.
Keep in mind, that P08's manual is not really true about outputs A/B: Output A
always carries voices 1 to 4, output B
always carries voices 5 to 8
This will lead to
- the division as described in the manual (voice A in output A, voice B in output B) in stacked or split modes only!
- voices 1 to 4 (in otput A) and 5 to 8 (in output B) being in different outputs even in normal mode!
This may (in my case does) have an impact, if You use different signal chains for outputs A and B at least in live situations, where You usually are requested to change sounds/effects quickly.
On the other hand it may result in at least some "interesting" sounds when in normal mode ...
HTH
Martin