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Devil Fish

Devil Fish modifications for the TB-303

Courtesy/Thanks to: Robin Whittle

Description: The Devil Fish is a modification to the TB-303 – a synthesiser/sequencer produced by Roland in 1982, which has played a crucial role in the development of electronic dance music. A detailed description of the Devil Fish can be found in the release notes release.html. Features include:

  • CV and Gate inputs.
  • CV inputs to turn on Slide and Accent.
  • CV input for Filter Frequency.
  • Output for Accent.
  • Audio In to filter.
  • Audio In to frequency modulate the filter.
  • Audio Out from filter (pre-VCA).
  • Overdrive pot to control the level of oscillator going to the filter: zero to 66.6 times normal level.
  • Separate control of Main Envelope Generator times in accented and non-accented notes.
  • Volume envelope is no longer fixed, and can be varied from 16 msec through 3 seconds and to no decay at all, i.e. for notes which last indefinitely.
  • Soft Attack control gives attack times between 0.3 and 30 msec. (TB-303 attack was ~3 msec.)
  • Slide time is variable to five times longer than normal.
  • Variable Filter Tracking causes the oscillator CV to control the filter frequency.
  • Internal Filter FM: a unique approach of AC coupled Filter FM from the audio output of the VCA.
  • The Muffler is a unique post VCA soft-clip distortion circuit which retains bass response.
  • Push-button to manually activate Accent.
  • Filter can be switched to self resonance.
  • Accent Sweep has three modes and can be disabled.
  • Filter Cut Off pot range doubled to 5 kHz max, and widened to include much lower frequencies.
  • Env Mod pot range extended to include zero and go as high as three times the normal maximum.
  • Bass response is improved.
  • Lithium battery for at least ten years battery backup, so there is no need to install C-cell batteries.
The Devil Fish can still perform all the functions of the TB-303.

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Files
patt303a.gif
   Pattern sheet for the TB303
cj03.mp3
   Sounddemonstration of the Devilfish mod
rw12.mp3
   Sounddemonstration of the Devilfish mod
df5-q6.jpe
   Picture of the DevilFish modification as it look on the TB303
df5-q6.jpe
   Picture of the DevilFish modification as it look on the TB303
devilfish_incase.jpg
   Picture of a TB303 with the Devilfish mod.
Links
www.firstpr.com.au/rwi/dfish/
   Devil Fish TB303 Modification homepage
www.firstpr.com.au/rwi/dfish/303-mo
   a page with simple TB-303 mods and maintenance tips
Manufacturers
Real World Interfaces
   The Company that developed and sells the Devilfish modification of the TB303. The main man behind the name is Robin Whittle.
Other versions/mods
TB 303
   Bassline Computer Controlled