
1 OSCILLATORS

Wide range knob mode can be switched by pressing opposite osc's RANGE while holding RANGE. Octaves can be switched independent of knob range. Modulation can be switched off by pressing RANGE while holding PARAPHONIC.

Osc edit mode:
press PARAPHONIC while holding RANGE to enter that mode
there are 4 "pages" in this mode, that can be switched with OSC_SYNC:
- 1st page is pitch wheel range - edit mode always starts from this page
you can set semitones from 0 to 12 with LFO_SHAPE knob, osc range leds indicate this number in binary by two bits from bottom to top. Synth remains playable, can be set by ear.
- 2nd page - octave switch dac scale adjust
This is same as turning v/oct trim on other synths. You need to tune relative pitch. 
Octaves can switched with LFO_SHAPE, while conversion coefficient adjusted by pressing OSC1 RANGE (decrease) or OSC2 RANGE (increase).
- 3rd page - notes dac - same as previous, but for internal midi-cv pitch
- 4th page - absolute tune.
This step must be done only after you happy with both scales. It need to be tuned to A-440Hz.
exit with PARAPHONIC and don't forget to save parameters

2 FILTER

Filter edit mode = PARAPHONIC holding FILTER_MODE
Same as oscillators, but this time only one page - scale trim.
You need to set resonance to max and disable oscillators by patching unconnected wire to filter input.

3 OSC SYNC MENU

hold OSC_SYNC and press...
- LFO_SYNC to switch envelope restart mode.
- OSC_RANGE to switch assign output modes: osc1, osc2, velocity, modwheel, aftertouch. Lfo leds will indicate mode.
- FLT_KEYTRACK to enter edit mode - 2 pages - scale and offset.
This output only 0 to 5V. If oscillator's pitch is higher, than octaves will be subtracted until it enters the range.

4 LFO

hold LFO_SYNC and press...
- OSC_RANGE to switch lfo modes.
- OSC_SYNC to switch MIDI sync.
- PARAPHONIC to set retrig phase position from LFO_SHAPE knob.
- FILTER_MODE to select sync edge of ext input /, \, or both /\.
Lfo sync from external input is not antialiased, i will try to upgrade that, but not shure, that it possible on this simple cpu. And i'm working on midi sync, main problem is that i don't want it to sharp switch between ratios but to remain analogue with glue to nearest ratio. i'm experimenting, don't wait it soon))
LFO MODES:
1 - classic
2 - Assign2 SHAPE - switch osc1/breathCC/velo/modwh/afttch. Attenuate with RATE
3 - Silent
4 - Poly
5 - Silent
Poly mode:
There are 5 voices, 2 oscillators + amplitude A-R envelope each.
You can ajust 4 Parameters in total with LFO knobs and button.
When LFO_SYNC is lit, SHAPE stands for PWM-Detune, and RATE for A and R
When unlit, SHAPE - osc2 amplitude and RATE - only R.

5 PARAPHONY
There are Additional paraphony "Pad mode" - gate starts only on second note, but both notes remains after keys releasing. Good for pads with long release.

6 SAVE STATE
All synth parameters - calibration, octaves, sync... are saved at once. To do this press OSC_SYNC while holding PARAPHONIC. Neutron will blink all leds. On next power on you will get exact same state.
In case something goes wrong there are reset procedure - PARAPHONIC + OSC_SYNC + KEYTRACK = all parameters to default.

I hope you have fun with this firmware, please tell me if you found some bugs or want some features. It is hobby project, so don't wait too much)