The Mad Professor Deep Blue Delay PCB can be used either before or after distortion, making it versatile for different setups. It performs exceptionally well on clean sounds, where the requirements for echo bandwidth and repeat formation are less stringent.

The delay tone is meticulously tuned, with careful attention to the first critical reflection and the decay of the repeats.

Creating a similar circuit in analog form would be prohibitively expensive. Achieving the same performance would require three to four of the best BBD chips, which are now only available as vintage parts, and the pedal would need to be about three times its current size.

Controls

• LEVEL: Sets the level of delayed signal mixed with the straight guitar tone, fully CCW there is only straight (un-effected) guitar signal heard and fully CW gives the loudest delay.
  
• DELAY: Controls the delay time from 25ms (fully CCW) to 450ms (fully CW)
  
• REPEAT: Controls the repeats of the delay signal, fully CCW gives one repeat and at fully CW