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Digital musical instrument
EPS
Ensoniq EPS
Manufacturer
Ensoniq
Dates
1988–1991
Price
£1695[1]
Technical specifications
Polyphony
20 voices
Synthesis type
13-bit samples
Velocity expression
Yes
aftertouch = Yes
Effects
none
Input/output
Keyboard
61-note with polyphonic aftertouch
Left-hand control
pitch-bend and modulation wheels
External control
MIDI
The Ensoniq Performance Sampler (EPS) was one of the first few affordable samplers on the market. It was manufactured from 1988 to 1991 by Ensoniq in Malvern, Pennsylvania, US. The EPS is a 13-bit sampler and replaced the Mirage - widely regarded as the first truly affordable sampling keyboard.
The EPS has a straightforward interface that is easy to use, with configurable controls geared for live performance. Because it has two processors, it can load and play up to eight instruments simultaneously (with another eight on reserve). The display is a 22-character, single-line vacuum fluorescent display. It boots from an integrated floppy disk drive (sourced from Sony or Matsushita), or from a SCSI drive connected to the expansion bay. The EPS has 256 Kwords of RAM on board. Ensoniq offered both a 2x (512 Kword) Memory Expander and a 4x (1 Mword) Memory Expander with SCSI interface. A company called Maartists offered both 4x and 8x memory expanders, allowing a total of 2 Mwords RAM. Extra RAM allows for longer and higher quality samples. The "2x" expander contains one 1x256Kbit and three 4x256Kbit chips, for a total of 13x256Kbits in addition to the onboard memory. The EPS is unusual in having a 13-bit sample memory word length, left-justified into the most significant bits of a 16-bit word.
The EPS uses double-sided, double-density 3.5" disks, formatted to 800k with ten 512-byte sectors per track. It can also read (but not write) Ensoniq Mirage sample disks.
The EPS uses MIDI and can be used as a controller of other instruments, or linked to a PC or Macintosh.
The EPS was superseded by the EPS-16 Plus which upgraded the sample size to 16 bits and added a 24-bit effects system. Other improvements include CD-ROM support in the optional SCSI interface and FlashBank storage for the OS and favorite sounds.
^Wrightson, Kendall (Jan 1991). "Sweet Sixteen". Sound On Sound. United Kingdom: SOS Publications Ltd. pp. 48–50. Retrieved 7 May 2024.
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