Device Details


Name | Version: Tonewheel Organ 1.0
Author: OspreyInstruments
Device Type: Instrument
Description: This is an electromechanical tonewheel organ model (Hammond B3/A100/L102). I previously released my L102 sample pack on PianoBooks and included some of my first M4L effects. I've improved my DSP chops quite a bit since then, so I thought it was worth revisiting this and implementing some of the ideas I have come up with since then.

Tone Generator:
This time, everything is synthetic, there are no samples to speak of. I modelled leakage (simplified, just the 4th octave), keyclick, and foldback.

Scanner Vibrato:
I have been working on a hardware version of a solid state scanner vibrato for quite some time (more to come on this soon!), so I am pretty well acquainted with the original schematics. I actually already had LTSpice simulations of them, so I wanted to try extracting impulse responses (IRs) of the frequency and phase response at each tap along the LC ladder. This turned out to be far superior than my original method of just naively using signal delays in the crossfeeding sequence. I suppose I could have also tried to model this with the right combination of all-pass filters and delay lines. Eventually, I'd like to figure out how to model this with a Wave Digital Filter, although this would be quite a challenge to implement directly in Max.

Rotary Speaker:
I also recoded the majority of the Leslie model. A lot of this effort went into cleaning up the model, and making the performance more robust, but I also added IRs for 3 more Leslie models, added a brake mode, added stereo mic placement on the bass rotor, and created a phase parameter so that it is possible to have the treble horn and bass rotor counterrotating relative to each other.


Live Version Used: 10.1.18
Max Version Used: 8.1.5
Date Added: Apr 03 2023 01:12:39
Date Last Updated: No Updates
Downloads: 0
License: None
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A beautiful sounding organ :)
Am I right in saying the draw bars cannot be assigned to an LFO? (The number boxes above them can, but this doesn't affect the draw bar position). If it's even possible, that would be a marvelous addition.
Very nice! A different approach than my Bertha and probably more focused on Hammonds - quite like your rotary speaker here.
This is a magnificent instrument. In its detail, control and accuracy -- I think it rivals anything out there. Deep thanks.

I was able to midi map the drawbars value to knobs on my midi controller and the numbers even change when dialed -- however they do not change the sound and do not move the graphic bars, which do work. I second the first commenter in saying this would be a fantastic addition.

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