Built-in Library sin(x), cos(x), abs(x), floor(x), max(a,b)
noise(): returns random 0-255.
tri(t, f), saw(t, f), sqr(t, f): oscillators.

Complex Patterning You can use variables: const beat = (t & t>>8); return beat;.
If your code contains "return", it's treated as a full function body.