D-50 Hammond Simulation


by Bruce Wahler

The D-50 and its rack-mount equivalent, the D-550, have four useful Hammond waveforms, which can be combined with "sines" (filtered square waves) to layer respectable Hammond tones:

Wave Name Comments
21 OrgPrc a combination of the 2nd, 3rd, and 5th harmonic, with long decay
48 Drawbr a full organ sound (888876678)
49 Horgan a very deep stop (008880000), one octave above the others
50 Lorgan somewhat brighter than Horgan (888800000)

Basic Tones

Waveform 21 is of questionable usefulness, but the others have many uses, especially when combined with synthesized sine waves, created from square waves that have been rather severely filtered:

Slope= -12
16' 800000000C310033F#2 <
5 1/3' 080000000G49435n/a
8' 008000000C49634n/a
4' 000800000C59235n/a
2 2/3' 000080000G59036n/a
2' 000008000C68836>B6
1 3/5' 000000800E68634>G6
1 1/3' 000000080G68435>E6
1' 000000008C78237>B5

The TVA band pass rolloff simulates the limited range of pitches available on tone wheel Hammonds, creating drawbar dropout, like a spinet tone wheel organ has. It is not possible to simulate foldback, like the console models have.


Percussion can be added by selecting the proper sine tone (4' or 2 2/3') and changing the decay for infintie to 47 for short decay and 62 for long decay.


The D-50 family has a built-in effects processor capable of generating a decent chorus vibrato. It can also be used to give a little tonal "edge" or "presence" to the sound, much as a real Hammond preamp does:

VibratoEffect SpeedDepthBalance
NoneChorus 20020
C1Chorus 21004448
C2Chorus 21004456
C3Chorus 21004463



Lorgan @ vol = 100
Drawbr @ vol = 85


Lorgan @ vol = 100
2 2/3' sine @ vol = 90


Horgan @ vol = 100, dropped -1 octave
1' sine @ vol = 82

Copyright (c) 1996-1999 by Bruce A. Wahler. Reprinting of this document for non-commercial purposes is freely allowed. Use at your own risk.

No laboratory animals were used during the evaluation of this product!