This meant that EPS-16+ disks could be loaded by the EPS with no problem. I believe the EPS worked with 16-bits internally, but the analog to digital and digital to analog converters could only handle 13 bits. After the EPS came the EPS 16 Plus (? or was there an EPS-16?) which was a full 16-bit sampler. It was a step up from the 8-bit Ensoniq Mirage. The rackmount version was called the EPS-M. The Ensoniq EPS is also known as the Classic, Original, or 13-bit EPS. I developed a minimal wavesample editor for the PC that could transfer wavesamples to and from the keyboard via MIDI. I did use it successfully to fly in vocals from a demo into a final version of one of my bands' 'hit' songs.
The sounds available aren't all that great, and it would occasionally crash on me. In the end, the EPS worked out ok for me. I needed a real keyboard, but I also wanted a sampler so that I could use it for production work in my studio. It cost me somewhere around $2500 as I recall. Way back in 1990 or so, I bought myself an Ensoniq EPS keyboard.