Felt Orbit ORHACK demo v1

Fixed sample: 01_felt_piano_C.wav
Single page: Octave / Cutoff / Vibrato depth / Vibrato rate
AUX: existing sustain latch
Playback mode: Gate
Key release: fixed 100 ms
Attack/declick: inherited from accepted Samplemento build
End fade: inherited 25 ms safety fade
No delay/reverb and no visual page yet.

Octave parameter is -2..+2 and is multiplied by 12 semitones inside the voice.
