Thanks. But what I am looking for is to render an array of notes to PCM (or whatever). I've tried defining the notes as frequencies and using a waveform renderi

Thanks. But what I am looking for is to render an array of notes to PCM (or whatever). I've tried defining the notes as frequencies and using a waveform rendering library (in Python) but it's very slow and clicky - a wave of a particular tone gets cut abruptly right before the next one starts and that produces a click. I need something more intelligent to sort of crossfade subsequent tones into each other or so. Perhaps I should just use a filter...