Felt Orbit v191 cleanup

- Defaults: Octave 0, Cutoff 127, Failure 0, Reverb 0.
- Removed obsolete vibrato parameter declarations/sends (from prior cleanup).
- Removed invalid legacy Pd connections (from prior cleanup).
- Removed unused/missing pd~ creation-argument plumbing from the 5 sample voices.
- pitchmod~ Failure path no longer requests a nonexistent second creation argument.
- soundfile_info now checks ../01_felt_piano_C.wav while audio playback keeps its existing path.
- Removed .DS_Store metadata.

No OLED/key-star/reverb/audio-character settings intentionally changed.
