A very collectable sampling/looper pedal from the late 80s. As with all the PDS series of pedals, two seperate footswitches perform bypass and repeat/sampling functions. It's a simple process. Step on the right pedal to engage the delay and then step on the left pedal to allow the delay to repeat continuously. This is lo-fi looping at it's finest. Timing a perfect loop is fairly tricky since there is no indictaion of when the loop is closing but a little practice cures that. The PDS also allows you to pitch-shift your loops with a simple turn of the delay knob. This is an amazing way to create all sorts of insane textures. It's a feature sadly lacking in newer units like the JamMan and the Boss RC-20 Loop Station. Soundwise, the PDS's 12 bit resolution has a very warm analog-like quality that you just can't find in any modern delays.