Sync function for synchronizing beat patterns across tracks

[Kyle Stetz]

@enedrio tossed out this idea to sync multiple tracks:

// t1 plays something, t2 playing something else
t1 = new track()
t2 = new track()
var g = new group(t1, t2)
g.beats([2, 3, 4], [4,5,6]).sync()

where sync sets the currentStep and untilNextBeat to 0, effectively matching the beginning of each track's beat pattern.

I think adding this to the group API is a no-brainer, but could this also be available globally? Perhaps as sync(tracks)?

I opened issue #11 as an idea about consolidating global variables into a Lissajous object so that the global namespace doesn't get overpopulated. If this was the case you could call Lissajous.sync(tracks).

Thoughts?

[Kyle Stetz]

Just realized: rather than being a global function, this should be a method of individual tracks as well.

var t1 = new track()
var t2 = new track()
t1.beat(4,3)
// some time later...
t2.beat(3,2,1,1).sync(t1)

sync could accept multiple tracks as arguments!

[enedrio]

that seems to be an intuitive solution. it fits nicely into the logic of the framework. I like it. :)

[Kyle Stetz]

I've added both of these based on your original implementation. Cheers 🍻

[enedrio]

Great! Thank you. :)