The precursor to the legendary Roland Space Echo. Here are the specs, the proofs in the playing, as usual.

Features
This unit has a great selection of inputs and outputs, including a "wet only" output through the "vocal amp" jack. The mode selector resembles the one on Roland Space Echos, and with 11 positions almost completely covers the range of head selections possible.
The EC-10 looks great with its red, black and gold design and cool, uncommon knobs. Plus the VU meter an logo light up when the unit is on, so it's a great looker on stage.
On the negative side, there are a few things that prevent this model from being a classic tape delay. First, the pinch roller doesn't disengage from the capstan, even when the unit is off. There is a thumbscrew that allows to "lock" the pinch roller away for long-time storage, which is better than nothing, but still a bit unpractical. Second, the tone controls are internal (see below); it would have been much nicer and convenient to have them on the main panel. Third, the fidelity of the unit isn't that great, probably because of the short tape loop.

Additional information / Comments
Ace Tone were the precursor to Roland, so this unit, along with the EC-20, are in a way the ancestors of the Space Echo RE series. The first Space Echos, the RE-100 and RE-200, corrected all the issues mentioned above: disengaging pinch roller, front panel tone controls and longer tape loop. So Ace Tone's first efforts were only the beginning of tape delay engineering for the Roland team. This at least makes them historically significant, if not the best units around...