Just give me a compact monophonic synth that will take over the Evolver desktop.
Make it stereo-path like the Evolver... Two analog oscillators from the P6, two digital oscillators from the Pro 2 ... Give it the Pro 2's dual filter, one for each side.
Add two more sample oscillators, once for each side too for creating small looped samples and wavetables.
Keep the Pro 2 sequencer, but just strip the physical controls off the device, to save on cost.
Throw in the FX engine of the P6 in the end.
Make a mode that allow you to set the audio output to mono, and split the two sides into two layers instead, giving you a duophonic two voice synth.
Price it at about the cost of a Tetra, but no more!
If you want to let it go even further... create a multi-mode, that split the device into a 6 part synth, with each oscillator working alone on their own MIDI channel, using the FX engine with send amounts from each part, preferably an individual output from each oscillator for individual processing... such a mode would be perfect for making the synth into a 6 part drummachine giving you fat analog kicks and toms via the analog oscillators, Wild Snares and percussion with the digital ones, and the sample oscillators could be for hard to synthesize sounds... Make each part capable of having two distinct sounds, controllable from a different MIDI channel, essentialy giving you 12 sounds, two of which share the same voice (useful for choking sounds like HiHat's etc.).
Regarding the sharing of the two filters... Let these be routable to individual oscillators like an insert effect, so you can choose where to use them for greatest flexibility.
Maybe a module for this kind of studio drumbox would be best as a module on it's own though to not make it too complex.
Anf of course: FULL MIDI CONTROL!