Isao Tomita
Tomita’s Whistle Patch
This is Isao Tomita’s famous “Whistle Patch” as documented in Allen Strange’s “Electronic Music” book (2nd edition).
Figure 9.45-Whistle Patch. This patch was kindly supplied by Japanese composer Isao Tomita and was originally designed for a Moog instrument. The instrument has been re-notated here as flow-chart format for the convenience of the general reader. The basis of the patch is a white noise source passed through a high Q low-pass filter. The various levels of control are quite interesting and deserve a detailed analysis. The filter is offset in the middle of its low range and this offset defines the lowest “whistle pitch. Pitch center is achieved by having the filter at maximum Q without going into oscillation. The filter is then voltage controlled by two voltage sources: a keyboard determines discrete pitch reference, and a mixed 5 Hz LFO and envelope generator (ADSR format) provide a transient sweep of the whistle pitch. EG 1, trigger by the keyboard, generates the defined envelope and a second EG controls the gain of a VCA, which in turn shapes the amplitude of the LFO triangle wave. Note in figure 9.45 that the mixer has a gain offset of .2 (on a scale of 0 to 1 but the mixed triangle wave and EG 2 contour will not affect the filter until both EGs are triggered. When this happens the filter will change to a new cut-off frequency as determined by the keyboard and will also have a transient sweep as pictured by the voltage function at the mixer output. The overall gain is determined by VCA 1, which is controlled by a third EG, also triggered by the keyboard.
Audio Signal Flow
- Noise through the LPF, and then to VCA #2.
EG Control
- Keyboard triggers 3 EGs.
Filter CV Modulation:
CV Input 1
- Keyboard
CV Input 2
- 5 Hz LFO Triangle wave to VCA #1
- Output of VCA #1 to Mixer Input 1
- EG #2 to Mixer Input 2
- Mixer Output to LPF CV Input 2
VCA Modulation
- EG #1 to VCA #1 CV Input
- EG #3 to VCA #2 CV Input
EG Settings: (Attack, Initial Decay, Sustain, Release)
- EG #1 – 50ms, 2ms, 10, 20ms
- EG #2 – 1s, 2ms, 10, 3ms
- EG #3 – 75ms, 50ms, 4, 7ms
Doepfer A-100 Version
Doepfer A-100 Version of the patch by Josef Mueller: http://www.modular-planet.de/instruments/whistle/whistle.html
Isao Tomita Resources
YouTube Music – https://music.youtube.com/channel/UCtdoWrfTHRBiwd_O4lKh8Rw
Apple Music – https://music.apple.com/us/artist/isao-tomita/268045
Wikipedia – https://en.wikipedia.org/wiki/Isao_Tomita
Red Bull Music Academy – https://www.redbullmusicacademy.com/lectures/isao-tomita
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