Addendum:
Through your hint about Apricot having "Mod X" and "Mod Y" I just noticed that even Regency allows for native per voice parameter modulation through slide notes. And not only that! Even "Velocity" allows for continous modulation of any parameter per voice through slide notes (even independently from amp, using the checkbox in the amp section). And I just noticed: Same for the pitch! You can un-keytrack the oscillators and use the midi pitch (with slide notes) to modulate yet another parameter per voice. That makes 4 per voice modulatable parameters!
You are amazing!!
____
Edit: And in Altitude there is even a 5th one of those: "Note Release"
*melts from chair in adoration*