Casio HT-3000

Hybrid Synthesizer

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200.00

street price

The Casio HT-3000 is a 61-key, 8-voice digital synthesizer released in 1987 as part of Casio’s HT and HZ series. It is notable for its Spectrum Dynamic (SD) Synthesis, a unique form of sound generation that blends elements of subtractive synthesis with digitally generated waveforms. The HT-3000 is designed for both live performance and sound design, offering a range of features including tone editing, MIDI compatibility, auto-rhythm, chord/operation memory, and pattern memory.

Sound Generation & Synthesis

SD Synthesis: The HT-3000 uses 32 digitally generated waveforms, some of which are harmonically rich and include pulse waves, ring modulation, and noise. These waveforms are processed through an analog VCF (low-pass filter) and DCA (amplifier), both with ADSR envelopes.
LFO: The LFO modulates pitch (vibrato) and volume (tremolo), with 5 waveform options (random, sawtooth up/down, square, triangle).
Filter: The analog filter (NJM2090 IC) is resonant and has a 24dB/octave slope, adding warmth and character to the sound.
Chorus Effect: A built-in stereo chorus enhances the sound palette.

Performance Features

Auto-Accompaniment: The Casio Chord function allows for one-finger or fingered chord accompaniment, with auto-harmonize for melodic harmonization.
Auto-Rhythm: 20 preset rhythms (expandable via RAM card) with fill-ins, endings, and tempo control.
Pattern Memory: Users can program 10 two-bar patterns and 10 one-bar fill-ins for bass, rhythm, and chords.
Chord/Operation Memory: Stores up to 640 chords and 198 operations per song, allowing for complex accompaniment sequences.

Connectivity & Expansion

MIDI: The HT-3000 supports MIDI IN/OUT/THRU, with 4 MIDI modes (A, B, C, D) for different performance setups.
RAM Card Slot: Optional RA-100 RAM card expands memory for tones, rhythms, and patterns.
Audio Outputs: Stereo line out, headphone jack, and built-in speakers for standalone use.

Programming & Usability

Editing: Parameters are edited using a rotary dial and two-digit codes (e.g., "10" for cutoff frequency). While powerful, the interface is less intuitive without the manual.
Presets: 20 preset tones for upper and lower sections, with 20 editable internal tones and 20 additional tones via RAM card.

Design & Build

Physical: Full-size 61-key keyboard, pitch bend/modulation wheels, and volume sliders.
Power: Operates on 6 D-cell batteries or an AC adapter (AD-5).

Category	Specification
Keyboard	61 keys (full-size)
Polyphony	8-note
Sound Generation	SD Synthesis (32 waveforms, analog VCF/DCA)
Tones	Upper: 20 preset, 20 internal, 20 RAM card; Lower: 10 preset, 10 internal, 10 RAM card
Auto-Rhythm	20 preset, 10 internal, 10 RAM card
Auto-Accompaniment	Casio Chord (one-finger/fingered), auto-harmonize
Keyboard Split	3 split points
Effects	Stereo chorus, pitch bender, key transpose, modulation wheel
Chord/Operation Memory	640 chords max. × 4 banks (with RAM card); 198 operations max. × 4 banks (with RAM card)
Pattern Memory	10 two-bar patterns + 10 one-bar fill-ins (expandable via RAM card)
MIDI	IN/OUT/THRU; 4 modes (A, B, C, D)
Connectivity	Line out (R/L), sustain pedal, foot volume, headphones, MIDI, RAM card slot
Power	6 D-cell batteries or AC adapter (AD-5, 9V DC)
Dimensions	980(W) × 320(D) × 93(H) mm / 38.56(W) × 12.63(D) × 3.69(H) in
Weight	7.2 kg / 15.8 lbs
Built-in Speakers	12 cm × 2 (2W + 2W)
Auto Power Off	After 6 minutes of inactivity

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Usage area
Synthesizer
Performance Synthesizer
Usage Design/ Form Factor
With Keys
Archetype
Hybrid, Digital+Analog
Polyphony
Voices	8
Tone Generator / Sound Synthesis
Synthesis Method	Analog Subtractive
Oscillator Type	Digital
Oscillators per voice	1
Waveform/ Spectral form (main generator): Waveform Count	32
Filter
Voltage Controlled Filter (VCF)
Low-pass Filter (LPF)
MIDI in/ out
IN
OUT
THRU
Keys
Type	Synth Action
Size	5
Number of Keys	61
Built-in controllers
Pitch Bend Wheel
Modulation Wheel
Dimensions
Height	93 mm
Width	980 mm
Depth	320 mm
Weight	7.2 kg
Production start	1987
	Production ended

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