Replacement output stage

Hi everyone,

I told a while ago that I would make (or at least try to make) a new 
output stage for the K5 (To have less background noise) so I think it 
should be time to start making some schematics and try them! ;)

The biggest problem I think I'll have is with the power supply. It only 
provides +6V DC to the opamps, and to get the best sound as possible, a 
new voltage would be requiered.

I'll try to keep the current potentiometer working, and maybe add an 
option to bypass it so it could, as an example, have a fixed-volume MIX 
and 1 to 4, but the volume control still working for the headphones, or 
something like that.

I think I should make it as flexible as possible by using jumpers. (But 
I will not provide any external switches, that's up to you, I will never 
drill an hole in the synth.)

Any suggestions?

Cheers,
Antoine