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PT-1 Mini Keyboard Synthesizer - Image 1

PT-1 Mini Keyboard Synthesizer

KeyboardDigitalMonophonic

Back in 1988, this pocket-sized wonder arrived as a stripped-down take on Casio's groundbreaking VL-1, packing monophonic synth magic into a form factor that fit in your backpack—perfect for sparking creativity on the go.

At just 13.5 x 3.7 x 0.7 inches and 1 pound, it features 29 (or sometimes listed as 31) ultra-mini keys alongside a simple control panel: 10 buttons for selecting from 4 digital sounds (piano, fantasy, violin, flute) generated via pulse waves of varying widths and octaves, 3 switches, a master tuning trimmer, 10 rhythms, and a 100-note sequencer with internal memory. Power it with 4 AA batteries or a 6V external PSU (negative center), and you've got a built-in speaker plus 1.5mm headphone out and mono audio jack for portable jams. Those tiny keys demand a light touch, but they deliver raw, lo-fi charm straight from the NEC D1867G CPU.

Vintage hunters love its cult status in white, red, blue, or rare pink editions—often popping up on secondhand markets for under $200—praised for nostalgic tones that cut through mixes today, though some note the fiddly keys take practice. It's a time capsule of Casio's early mini-keyboard era, ideal for beatmakers chasing that authentic 80s grit.

Released

1988

Status

Discontinued

Synthesizer
Format
Keyboard, Micro
Type
Digital
Internal Battery
Yes
Voice
A/D
Digital
Polyphony
Monophonic
Oscillators
0
Oscillator Type
-
Voices
1
Filter
No
Envelopes
-
LFO
-
Effects
No
Expression
Aftertouch
No
Velocity
No
MPE
No
Additional
built-in speaker
Software
-
I/O
Audio In
-
Audio Out
1 mono
Headphone
1x 1.5mm
MIDI
-
MIDI Type
-
Ports
-
Wi-Fi
-
Workflow
Arpeggiator
-
Sequencer
Yes
Mod Matrix
No
Memory
Yes
Measurements
Dimensions
13.5 x 3.7 x 0.7 inches
Weight
1 pounds
Last updated Feb 25, 2026