New simplex oscillator
- Added: Simplex Oscillator (SN-OSC)
- Fixed: Sync out of simple and plus oscillators only giving 1v
- Fixed: Simplex Noise LFOs stop working after some time
- Fixed: Random Mix stop working after some time
- Changed: Random Mute CV as mod instead of override of mute knob
- Changed: Rebased all oscillators to C4 instead of A4 (#9)