Digitron Synthesizer

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- added help about recorder
- added new midi setting screen
- added ability to set midi channels per track
- added new modules:
wavefolder, modulation, slew limiter, hi-pass/low-pass filter, joystick control
- added reset input for vco1 and lfo1
- added linear fm input for vco1
- added new presets from TrifleGrills
- added midi channel selector
- fixed lfo frequency calculation
- Oscilloscope performance improvements
- overall performance improvements