Grungy Digital Tonewheels (was Re[3]: What means

[gstopp at fibermux.com]

     Hey Bob, cool post! If we want to go all the way with Hammond 
     simulation, here's some more things that contribute to the sound:
     
     * Different keys have different amounts of crosstalk, and each organ
       is different
     
     * The 9 contacts and their respective busbars beneath each key make
       and break contact sequentially during the key's travel - pull out
       all the drawbars and s-l-o-w-l-y depress a key to hear this effect
     
     * Each of the 9 contacts adds its own little "pop" to the overall
       keyclick
     
     * All the other "organic" stuff like tube non-linearities, scanner
       vibrato, leslie rotor acoustics, that we all know and love
     
     The 9 contacts under each key that close sequentially during key 
     depression make for a certain type of velocity sensitivity. I 
     personally feel that this effect (combined with the expression pedal 
     usually) allows the listener to actually tell how hard the organ is 
     being played!
     
     I once considered building a Hammond simulator using a top-octave 
     generator plus sine filters, but I just got too good of a sound with 
     my real (customized) CV and its Leslie 122. The CV has a super-duper 
     percussion thing that I added that really turned out bitchen beyond my 
     expectations. A certain famous keyboard player whose initials are KE 
     took it on the road a few years ago and prononced it "one of the 
     best-sounding organs" he's ever played. That made my day, believe me.
     
     As for the gear teeth ratio details, I'll bet Al Goff knows - hey I 
     hear he just got a new web page - http://www.goffprof.com.
     
     - Gene
     gstopp at fibermux.com


______________________________ Reply Separator _________________________________
Subject: Grungy Digital Tonewheels (was Re[3]: What means 
Author:  Bob.Schrum at harpercollins.com at ccrelayout
Date:    5/31/96 8:03 AM

     I'm not sure anyone on the Hammond list would really know, since the 
     tonewheel generator, to most, is just that thing that makes the organ's 
     sound unique, but are not sure why.   I'm sure the gear ratios are 
     exactly equal to the frequency ratios between semitones in an equal 
     tempered scale.  The MK50240 dividers are definitely just 
     approximations. 
     
     Let's make this thread really DIY...
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