Hi all,

I have made a clonewheel organ. I have based my design as far as possible on information I found on the internet.

To me it is usable (at least when there is no real organ nearby to compare with) and anyone is free to use it as is.

But, it doesnt really compare with the real thing, even though I never had the pleasure to laid my hands on one.

Any suggestions on improvements are very welcome!

Things included in my simulation:

• tonewheel frequencies rather than the normal note frequencies
• percussion effect
• keyclick (I do think its very good though)
• vibrato and chorus scanner (found very little info on this - and it sucks!)
• rotary speaker emulation
• ability to store 4 presets

Things I know it is lacking:

• tonewheel waveform is simplified to a sinewave
• crosstalk (have not found any good info on this)

I have made a input controller that fit my midi-gear to get quick access to the drawbars, presets, overdrive and the leslie. I could recommend anyone that want to use it to make such a thing themselves. Use the command inlet for each abstraction to control it.

It should work with pd-extended.

/Tobias

http://www.pdpatchrepo.info/hurleur/hammond.zip

I will try to make a new attempt on a leslie with two rotors and need a good crossover filter.

Any suggestions?

I made a little patch to measure the filter response for different frequencies to analyze my attempt on a crossover filter.

I tried to come up with two filters that splits the audio at some crossover frequency that under addition is pretty linear.

I came up with something (almost) decent, but it feels like there must be an easier way to do this...

/Tobias

@Maelstorm Thank you, it seems to work (and I can't hear the 1dB noise).

[OT] when I use freeverb it works fine until I stop playing for like 10 seconds or longer and then continue to play it gets terrible! My midi-keypresses lag and the sound lag and it just sounds terrible and it takes a few seconds for it to catch up...

I'm (mostly) running pd on linux.

Based on all the comments and suggestions I got in this thread I have been able to improve my organ pretty much (irony). Especially the leslie had some major bugs. I also made a somewhat desent vibrato/chorus scanner.

I like my improved leslie speaker. I emulate sound in 3 different angles and use some short delay lines to emulate sound bouncing within the leslie cabinet. In the end I only tap out sound from two of those angles for left and right channel.

First, I made a crossover and two separate rotating speakers for bass and treble with slightly different speeds. But it didn't added anything good so I skipped it.

I have now had my first actual gig using the organ- yeah!

If you try it out - dont forget to turn on the leslie rotation, there is where the feeling comes in.

If you are new to organs, take a look here for some hints: http://www.dairiki.org/HammondWiki/DrawbarRegistrations

http://www.pdpatchrepo.info/hurleur/hammond.zip

Forgot to mention, open the file called run_me.pd to try it out...