Organ Tone Wheel development.

colB

https://community.native-instruments.com/discussion/comment/178701#Comment_178701

you can just repeatedly frequency double a triangle wave and you get a sine and cosine for just a couple more multiply adds a piece

Here's an alternative approach similar to the Hammond model. It uses a single continuous ramp. Each related partial then derives it's triangle from the single ramp accumulator. Not sure if it's cheaper than just using lots of discrete sines. But it works.

It's pretty cheap to incorporate phase shift and also detune (although the current implementation is more costly when detune is modulated)

Here's a fun little synth thing I was messing about with this evening using the basic idea. Envelope can control the detune which increases for higher partials, so interesting transients can be created… lots of other possibilities here too.

sine partials ramp test 04.ens

Studiowaves

https://community.native-instruments.com/discussion/comment/179367#Comment_179367

This seems to be working out for the most part. I used Chets Hammy 91 and added the above stuff. There's a Leslie with it too. I'm glad you brought that up about the tone wheel and it only makes sense the drawbars are not clean. Here's the ensemble and an mp3 of us warming up just screwing around but the organ sounds really good here and there imo. Deleted this junk, look below, for a decent recording.

colB

https://community.native-instruments.com/discussion/comment/179467#Comment_179467

Its hard to tell from the mp3 because there is a lot of noise in the recording. It sounds like Hammy91 with some noise mixed in?

Main thing is that you are satisfied with the result!

Studiowaves

Hammy and Dessy.zip

I might call this good enough. The Tone bar has overtones and noise and is probably fine for my use. I added a tone bar that beefs up the harmonic structure of each drawbar. I noticed the drawbars are like that from a you tube demo. They're not pure sine wave at all, I suspect the tone wheels are layed out with the second and third harmonic on each side of the fundamental. Or the gear teeth are shaped like that. So I added that in the tone bar.