The Mad Professor Deep Blue Delay is a natural sounding digital / analog delay, with an analog direct signal path and has about the same bandwidth as the classic tape echo units which can be used in front of an amplifier or in amplifier effects loops. Since there are no noise reduction circuits it keeps decay of echoes as natural as possible also the signal has a tuned filtering to allow extreme settings without any interference. Furthermore: the delay is specially designed to work well with distorted tone, as this is the most critical application, where delays often fail!

You can use the pedal before or after distortion. As such, it will work exceptionally well on clean sounds where requirements are less stringent, especially in terms of echo bandwidth and repeat formation.