The S4 is the rackmount version of the QuadraSynth. It can be expanded with 4MB and 8MB Alesis Q Cards and includes drum kits from the D4 drum module. The S4 was later upgraded and released as the S4 Plus.
Year Released: 1993
Polyphony: 64 notes
Multitimbral: 16 parts
Preset Patches: 128
User Patches: 128
Preset Performances: 100
User Performances: 100
ROM: 16MB sampled at 48 kHz
Effects: Onboard effects based on the Alesis Q2 FX processor
Outputs: 4 1/4" audio outputs, ADAT optical
This is a 1-space rack unit.
Alesis S4 Quadrasynth 90s Black ($201.26)
Alesis Quadrasynth S4 ($180)
Alesis Quadrasynth S4 ($243.72)
Alesis S4 Plus Quadrasynth ($200)