Simpler modulation

[ghost]

Hi!
I've ported this project to JS: https://gitlab.com/SopaXorzTaker/furby-commander.

I do the pulse shaping to avoid loud distortion in the audio, however the way the app does this (and this project too) is kind of inefficient.

Instead of gradually changing the frequency between the tones, a simpler approach with multiplying the sine waves by the sinc function for every pulse (see furby.js) also works.

This might be actually producing even less aliasing and thus noise.