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Casio MT-40 - Image 1

Casio MT-40

KeyboardDigitalPolyphonic

Back in 1981, this little white keyboard quietly dropped a rhythm preset called "Rock" that would ignite the Sleng Teng riddim, flipping Jamaican reggae into a digital dancehall explosion sampled across countless tracks.

It's a compact digital Casiotone with 37 full-size main keys plus 15 smaller bass keys on the left, all feeding into 9-voice polyphony—eight notes from the main keyboard and one monophonic bass line. Pre-recorded ROM sounds deliver 22 timbres like pipe organ, flute, synth fuzz, brass, and strings, mixed through a simple DAC for that raw, lo-fi 80s arcade vibe. Six rhythms drive the built-in drum machine, adjustable via tempo knob and fill button for quick 16th-note bursts or pattern toggles, with vibrato and sustain effects adding expression; a single mono audio out lets you plug in, and it runs on batteries for portability.

Owners love its massive, unalterable bass tone and punchy analog-triggered drums that hold up in modern mixes, though some note the harsher voices like brass can feel cold next to smoother ones. A true one-person groove machine that punched way above its toy-like price tag.

Released

1981

Status

Discontinued

Synthesizer
Format
Keyboard
Type
Digital
Internal Battery
-
Voice
A/D
Digital
Polyphony
Polyphonic
Oscillators
-
Oscillator Type
-
Voices
9
Filter
No
Envelopes
-
LFO
-
Effects
Vibrato, Sustain
Expression
Aftertouch
No
Velocity
-
MPE
No
Additional
-
Software
-
I/O
Audio In
-
Audio Out
1 mono
Headphone
-
MIDI
-
MIDI Type
-
Ports
-
Wi-Fi
No
Workflow
Arpeggiator
-
Sequencer
No
Mod Matrix
No
Memory
-
Measurements
Dimensions
-
Weight
-
Last updated Feb 25, 2026