S-1 TWEAK : 3 small improvements to make a great synthesizer

[pictocompany]

S-1 tweak is powerful, but in use, it lacks little to make a great synthesizer :

+ allow bipolar envelop depth value (knob Env filter) : -100 to 100

+ add detune OSC. 3 possibilities :
- [POLY] pad/sound mode:unisson/add detune parameter
- [POLY] pad/sound mode:chord/for each voice add fine tune parameter
- for each OSC, add tune / fine tune parameter

+ extend modulation source (LFO and env) to other destinations. Suggestions :
- add Pitch modulation parameter in menu (pad 15)
- add OSC DRAW multiply modulation parameter
- add OSC CHOP overtone modulation parameter
- add OSC CHOP comb modulation parameter
For each parameters, 2 sub menu :
- env depth (env.d) : -100 to 100
- LFO depth (lfo.d) : 0 to 100

Thanks a lot Roland team if you read these requests.