I will try that with my LFO, i just have it resetting to 0 when it overflows. mind you its counting to 4177919!
I dont really mind having the LFO in the main loop, it is not driving a voltage like yours, only changing internal things. (by the way i bet your LFO will seem quite different once you get rid of all that serial.printing 
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Re MIDI controllers.
I used to use MIDI CC pots, you can see it in the older videos, but since this is a module i like it to have its own knobs and restart just where I left it when I upload a new sketch or power on.
With MIDI every time i powered up, i would have the oscillator in a basic state until i moved each MIDI knob to where i wanted it, that was very annoying, by the time i got to where i was i would have forgot what i was listening to when i decided to make a change 
I do have a MIDI control input array which I will set up to receive changes, probably with a local/remote switch it will also output any knob twiddling to be recorded in the sequencer. Then i could also use it as a MIDI controller.