I've updated this, so that the gain is the same for all waveforms now (before it was half for sine and triangle). However, sawtooth and square are still louder

I've updated this, so that the gain is the same for all waveforms now (before it was half for sine and triangle). However, sawtooth and square are still louder because they're made of three osillators (spread based on touch surface). Another reason for the difference between waveforms is multitouch, this is also something that sounds different for different waveforms.