I totally agree with you Pjd.
It would be good if Yamaha implemented some voice editing parameters such as: Oscillators, with their AMP, and respective PITCH (Can be Osc1, Osc2) EG (Envelope Generators), LFO (Low Frequency Oscillator) LFO1, LFO2
Crossfade, to create nice transitions between various layers of sound.
All this plus what comes from the factory in the SX series, and Genos which is: Cut, Release, Attack, Decay.
These are just my two cents
Greetings
Hans