So, I took a break from working on CetoneSynth2 and made a small ... let's call it 'fun' plugin.
I allways wanted to know how a Hammond sounds like ... or better: I allways wanted to have a small, free Hammond like VSTi. After querying google about "freeware hammond vst" didn't give any usefull results, I decided to do my own "Hammond like VSTi".
Because I don't own a Hammond, I looked up into the Hammond patent files, Wikipedia and other resources. After some thinking I came up with this: "CetoneOrg"
1. I implemented 89 tonewheels, using the original frequency dividers given in the patent file and 60Hz AC (virtually).
2. step was to figure out, how these tonewheels are controlled. After some more thinking I used following aproach:
All tonewheels are running constantly and when a key is pressed there are only "mixer control voltages" sent. "Higher voltages" override "lower voltages".
3. Harmonic foldback ... that was easy.
4. Key click ... was easy too.
5. I heard that when you press a key on the Hammond slowly, the tonewheels get "switched on" in series with a small delay ... so I implemented this controlled by velocity. Dunno if a real Hammond sounds like this, but I like it.
6. I thought about a virtual Leslie but discared this idea because I didn't want to simulate a doppler effect. So I just implemented a LFO which controls vibrato and panning and made the phase of the panning modulation adjustable.
7. Added a chorus/flanger
8. Added reverb
9. Added some controls for key click amount and tone (changes are subtle and are more audible when using higher FS)
10. Added pre and post volume for saturation
11. Added saturation to the chorus unit
12. Added a final low-pass filter
Now, some specs:
- 89 voice polyphonic (61 notes)
- Adjustable tone and key click
- LFO for vibrato and panning modulation
- Chorus/flanger
- Reverb
- tanh like saturation
- no GUI (right now)
- no presets (right now)
I will upload this thing tonight ... maybe someone will use this ... and if so, start a thread at KVR and notify me about this.
I allways wanted to know how a Hammond sounds like ... or better: I allways wanted to have a small, free Hammond like VSTi. After querying google about "freeware hammond vst" didn't give any usefull results, I decided to do my own "Hammond like VSTi".
Because I don't own a Hammond, I looked up into the Hammond patent files, Wikipedia and other resources. After some thinking I came up with this: "CetoneOrg"
1. I implemented 89 tonewheels, using the original frequency dividers given in the patent file and 60Hz AC (virtually).
2. step was to figure out, how these tonewheels are controlled. After some more thinking I used following aproach:
All tonewheels are running constantly and when a key is pressed there are only "mixer control voltages" sent. "Higher voltages" override "lower voltages".
3. Harmonic foldback ... that was easy.
4. Key click ... was easy too.
5. I heard that when you press a key on the Hammond slowly, the tonewheels get "switched on" in series with a small delay ... so I implemented this controlled by velocity. Dunno if a real Hammond sounds like this, but I like it.
6. I thought about a virtual Leslie but discared this idea because I didn't want to simulate a doppler effect. So I just implemented a LFO which controls vibrato and panning and made the phase of the panning modulation adjustable.
7. Added a chorus/flanger
8. Added reverb
9. Added some controls for key click amount and tone (changes are subtle and are more audible when using higher FS)
10. Added pre and post volume for saturation
11. Added saturation to the chorus unit
12. Added a final low-pass filter
Now, some specs:
- 89 voice polyphonic (61 notes)
- Adjustable tone and key click
- LFO for vibrato and panning modulation
- Chorus/flanger
- Reverb
- tanh like saturation
- no GUI (right now)
- no presets (right now)
I will upload this thing tonight ... maybe someone will use this ... and if so, start a thread at KVR and notify me about this.
posted by René at 00:56
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