Merge pull request #9 from DylanMeeus/perf-improvements

Perf improvements

Fix error handling in tests

Merge branch 'note-to-freq'

Restore ADSR signature

Add function for converting float64 slices to slices of wave frames

Remove print statements from lib

Pass the desired shape as a program flag

Add example for triangle wave generation / fix math

Update readme

Add oscillator constructor for phase offset