Felt Orbit ORHACK demo v23 - polish pass

Based on user-confirmed v22.

Changes:
- Key-up release: 700 ms -> 600 ms.
- Octave knob range: -1 / 0 / +1 only.
  MIDI note input is NOT limited by this knob; lower MIDI keys can still play
  below the current octave. This only limits the manual octave transpose control.
- Vibrato Rate range now starts at 0.0 Hz and default is 0.0 Hz.
- Bottom status line:
    startup/latch off -> Sustain: Off
    AUX latch on      -> Sustain: On
  (replaces the unwanted Gate mode status after startup)

Unchanged:
- working Gate+latch behavior
- fixed 217956-frame sample length
- pitch mapping
- cutoff and vibrato depth behavior
