Added third pitchMode

[BartBral]

Added third pitchMode (2), where Start pot controls speed and Start CV controls start position.

[plutoro]

also similar thing, it is possible to have this please:

the station knob to become start point and the start knob to be the pitch option (or the way around), the idea is to make a compromise and to control the same station (and change the station by just changing the bank manually) but to be able to control the start point and the pitch in the same time on the same station, and the reset to have the same function.
thanks guys ps: newby to programming in here

[dessertplanet]

In the same vein as this- in my fork I have set it up so you can toggle pitchMode from the front panel by holding the reset button until you see the LEDs flash (long-er press). The trade off is you need to normal-long-press in order to increment through the banks but that is fine for my workflow. Check it out: https://github.com/dessertplanet/RadioMusic (button-pitch-mode branch)

[dessertplanet]

I ended up wanting the behaviour described in this PR instead of my button solution- I've implemented a similar (if simpler?) version here: https://github.com/dessertplanet/RadioMusic/tree/separate-pitch-start-2 with a new boolean setting instead of a new pitch mode.