Casio CT-S1 61-Key Digital Synthesizer Red

The Casio CT-S1 breaks the mold of compact keyboards, combining a sleek, minimalist red body with the acclaimed AiX Sound Source. Unlike typical entry-level instruments, it delivers touch-responsive piano-style keys and a bass-reflex speaker system that produces surprisingly deep, room-filling sound. Whether you're practicing at home, recording in a studio, or performing on the go, the CT-S1 offers authentic tones and expressive control in a lightweight, portable package.

Highlights

• 61 full-size, touch-responsive keys with adjustable sensitivity
• AiX Sound Source with 61 tones, including advanced and classic Casio sounds
• 64-note polyphony for rich, layered performances
• Horizontal Bass Reflex speaker system for surprisingly deep sound
• Lightweight and portable, with optional battery operation (6 x AA)
• USB and audio connectivity for use with apps and recording
• Optional Bluetooth MIDI/Audio via WU-BT10 adapter (sold separately)

In daily use

From the first note, the CT-S1 feels like a serious instrument. The keys respond to your playing dynamics, and the sound engine delivers everything from grand pianos to vintage synths with clarity. The built-in effects—reverb, chorus, delay, and DSP—let you shape your sound instantly. Connect to the Casio Music Space app via USB or optional Bluetooth adapter to expand your creative possibilities, or simply plug in headphones for silent practice. The metronome and MIDI recorder support your practice and composition, while the transpose and tuning functions add flexibility for ensemble play.

Full specifications

• Keyboard: 61 piano-style keys, touch response (3 levels, off)
• Sound engine: AiX Sound Source
• Maximum polyphony: 64 notes
• Tones: 61 (10 advanced, 12 Casio classic)
• Effects: Reverb (24), Chorus (12), Delay (15), DSP (100 presets), Master EQ (10 presets + 1 user)
• Metronome: Yes
• MIDI Recorder: 1 song, approx. 40,000 notes
• Speakers: 2 x (13cm x 6cm oval) with Horizontal Bass Reflex System
• Amplifier Output: 5W (2.5W + 2.5W)
• Connectivity: Headphones/Output (Stereo mini), Pedal (Standard jack), Audio In (Stereo mini), USB TO HOST (micro B), USB TO DEVICE (Type A)
• Power Supply: AC Adaptor (AD-E95100L) or 6 x AA batteries
• Battery Life: Approx. 3 hours (alkaline batteries)
• Colour: Red
• App Integration: Casio Music Space
• Transpose Function: Yes
• Tuning Function: Yes

Final note

The Casio CT-S1 proves that great sound and portability can coexist. Its expressive touch, rich tone palette, and deep bass response make it a standout choice for musicians who demand more from a compact keyboard.