DELTA T is a feature-rich audio delay module. It's based on the notorious PT2399 digital delay chip and has the trademark combination of lush and noisy that the best of the PT2399-based delays have. However, it goes beyound the delay topography most people are used to. Two input signals are mixed down with the feedback loop return and passed to the delay chip, which is then crossfaded with the initial sound mixture. Voltage control over delay time and crossfade adds great dynamic delay character modulation possibilities. The feedback loop is broken out to dedicated jacks, and any additional sound processor can be put in the module's feedback loop to modify its character. Delay tempo is available as a clocking pulse from the CLK output, and is indicated by the LED, allowing to sync other modules to DELTA T.


  • 8 HP
  • 40 mm deep
  • 55mA @ +12V
  • 35mA @ -12V
  • --- @ +5V


  • Two sound inputs - one attenuated, one direct
  • Vactrol-based delay time voltage control circuit - no clicks or pops!
  • Time CV input with an attenuverter
  • Vactrol-based dry/wet voltage-cotnrolled crossfader
  • Tempo indication and tempo clocking pulse output
  • Broken-out feedback loop to insert other sound modifiers into

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