Strange Devil Expression is mainly an echo pedal with a send-return loop. You can connect an external pedal to these jacks to make the new pedal set a colour to the repeated sound. If nothing is connected to the loop it is like a regular echo (without a loop).
Strange Devil Echo has three control knobs, Repeats (number of repeats), Interval (time between repeats) and Mix (mix between effects and clean sound). It is possible to turn up Repeats to get positive feedback, where each repeat sound louder that the one before – if you are looking for noise and experimental sounds.
True Bypass! 9V power supply (not included).
The clip below shows a recording of a previous version of this pedal, a mix control and a an expression jack has been added since the recording.