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SY-55 - Image 1

SY-55

KeyboardDigitalPolyphonic

Back in the early '90s, this synth stood out for packing AWM2 tech into a sleek, affordable package that let players layer up to four waveform elements with real-time filter sweeps mimicking analog warmth—all without breaking the bank.

At its core is a 16-bit Advanced Wave Memory 2 engine with 74 onboard waveforms sampled at 32 or 48 kHz, feeding into 16-voice polyphony and 8-part multitimbrality. Each of the four elements gets dual digital filters—one low-pass, the other switchable low/high-pass—with 6- and 7-stage envelopes, resonance, plus dedicated amplitude, pitch, and a versatile LFO offering saw, sine, square, triangle, and random shapes. Controls include a 61-key velocity- and aftertouch-sensitive keyboard, pitch/mod wheels, data slider, breath controller input, foot volume, and sustain pedal jack, all on a compact panel with 16x2 LCD and 39 buttons. It weighs just 9.7kg across 911x325x90mm dimensions, with stereo outs, MIDI I/O/T, card slots for extra waves/voices, and 34 editable DSP effects like reverb, delay, early reflections, and distortion. An 8-track sequencer holds 8 songs up to 8,000 notes, with tempo sync from 30-260 BPM.

Players have long praised its rich, CD-quality tones and deep editing for everything from pads to leads, though some note the sequencer feels basic next to beefier siblings like the SY77. It's a hidden gem for anyone chasing '90s digital versatility on a budget.

Released

1992

Status

Discontinued

Synthesizer
Format
Keyboard
Type
Sample-based, PCM
Internal Battery
No
Voice
A/D
Digital
Polyphony
Polyphonic
Oscillators
4
Oscillator Type
Sample-based
Voices
16
Filter
Lowpass, Highpass, 12dB/oct (2-pole)
Envelopes
3
LFO
1
Effects
Reverb, Delay, Early Reflection, Tone Control, Distortion
Expression
Aftertouch
Polyphonic
Velocity
Yes
MPE
No
Additional
-
Software
-
I/O
Audio In
-
Audio Out
Stereo
Headphone
-
MIDI
In, Out, Thru
MIDI Type
DIN (5-pin)
Ports
Memory Card
Wi-Fi
No
Workflow
Arpeggiator
-
Sequencer
Yes
Mod Matrix
-
Memory
64 preset, 64 user
Measurements
Dimensions
911 x 325 x 90 mm
Weight
9.7 kg
Last updated Mar 25, 2026