The concept of creating an initial tone, which is then filtered and passed through an envelope generator to give us a sense of articulation, sustain and delay is just... wow. I'll never listen to electronic music the same way again.
Having been doing various tutorials with Logic's ES2 synthesizer, which is a mainly a subtractive synthesizer. Whipped up this little test in Houdini's chops for giggles.
It's exactly as described above. My base tone is a Triangle wave, which seems to give a very pure tone with some harmonics. A square wave is then generated and passed to the trigger chop, which generates envelopes. (The envelope controls are surprisingly, a step ahead of the ES2's controls, including features such as interpolation type, delay *hold* length, among many others).
CHOPs node layout
Multiplying the envelope train against the triangle wave gives a psuedo wind instrument sound.
I have a copy of Andrew Lowell's Simultaneous Music, Animation, and Sound with Houdini - from years back that I did not finish. Looks like it's time to figure out how I can link my music to houdini :)