Organ Tone Wheel development.

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  • colB
    colB Member Posts: 953 Guru
    edited September 23
    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.

    image.png

    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
    Studiowaves Member Posts: 634 Advisor
    edited September 25
    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
    colB Member Posts: 953 Guru
    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
    Studiowaves Member Posts: 634 Advisor
    edited September 28
    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.

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