Comments from the music media at the time.

“Trippy Spaced-out Dub Delay… a dub creators dream, the quality and sound of the echo, the warmth, the rubbery juicy echos, the spacey decay, and most of all the real-time playability of the unit is just great.”

“A gem of a unit, really not like anything else. A space echo 201 is different, and is very nice, but this thing has its own mojo completely. At a fraction of the price”

The EP-100 has two instrument inputs that mix to feed the delay line plus an output mix control to balance delay & the direct signal. Delay time & feedback are on pots so the delay time is continuously variable – a great feature when playing with feedback!

It’s possible to get the Echopet to feed back continuously and it does that trick without going into gross distortion. Sweeping the delay time pitch-shifts the feedback giving some excellent swooping delays which change in character as the high-end rolls off. It’s a great effect that can’t be replicated with other delays

When overdriven the EP-100 distorts nicely – the second Youtube demo showcases this quite well. 

I bought this back in the late 70's or early 80's and used it with my Rhodes piano to create amazing atmospheric swirling sounds that none of the other bands around my area could create. Synths where hugely expensive and this was a great way to creat some of those sounds.