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270 Chapter 20 ES2
The Big Twirl, Basically (Wheelrocker)
This quite ordinary organ patch doesn’t hold any deep, high-end sound design
secrets: it is just a combination of three oscillators—with mixed wave levels. You’ll
probably find a different combination, which more closely matches your vision of what
an organ sounds like. Check out the Digiwaves.
Focus your attention on the mod wheel’s response: hold a chord, and bring the wheel
in by moving it slowly upwards, until you reach the top (maximum).
The intention behind the programming of this (mod wheel) modulation is to simulate
an accelerating Leslie rotor speaker.
The modulation routings do the following jobs:
 Modulation 1 (Cutoff 1) assigns envelope 2 to Filter 1 (the only one used for this
patch), and produces a little organ key click with the envelope. The filter is opened
slightly (with Keyboard as via) when playing in the higher keyboard range (with the
maximum value).
 Modulation 2 and 3 (Pitch 2/Pitch 3) bring in LFO 1 vibrato, and both Oscillators are
modulated out of phase.
 Modulation 5 reduces the overall volume—according to personal taste, the organ’s
level shouldn’t increase too drastically when all modulations are moved to their
respective maximums.
 Modulations 6 and 7 (Pitch 2/Pitch 3) detune Oscillators 2 and 3 against each other,
within symmetrical values (to avoid the sound getting out of tune, overall). Again,
both work out of phase with modulations 2 and 3; Oscillator 1 remains at a stable
pitch.
 Modulation 8 brings in LFO1 as a modulator for panorama movement—this patch
changes from mono to stereo. If you would prefer a full stereo sound, with a slowly
rotating Leslie in its idle position, just set an amount equal to the desired minimum
value, thereby achieving a permanent, slow rotation. Another modification you may
wish to try is a higher value, resulting in more extreme channel separation.
 Modulation 9 speeds up LFO 2’s modulation frequency.
 Modulation 10: A little Cutoff was added to Filter 1, increasing the intensity of the
big twirl.
Please feel free to find your own values. While doing so, keep in mind the fact that
there are two modulation couples, which should only be changed symmetrically (Mod.
2 and 3 work as a pair of twins, and also Mod. 6 and 7). So, if you change Pitch 2’s
maximum to a lower minus value, remember to set Pitch 3’s maximum value to the
same positive amount (same goes for modulation pair 6 and 7).