The Korg Nautilus 73 represents the sweet spot in the range, offering extended playing range while maintaining portability. This model features Korg's Natural Touch semi-weighted keyboard across its 73 keys (C-C), a significant advantage over the Kronos 73 which uses a shorter RH3 hammer action. This makes the Nautilus 73 considerably lighter and more manageable while providing the preferred feel for synthesizer and workstation applications.

Like all Nautilus models, it houses nine sophisticated synthesizer engines in a single integrated platform. The SGX-2 Premium Piano engine captures the nuances of world-class grand pianos with full stereo sampling, up to 12 velocity levels, and authentic string resonance. The EP-1 engine delivers seven meticulously modeled electric piano sounds, from early and late Tine models to vintage Reed instruments, each with dedicated amp and cabinet modeling.

The comprehensive synthesis capabilities span from the HD-1's high-definition PCM engine with advanced vector synthesis to the physically modeled STR-1 engine for acoustic and electric guitars, harpsichord, and ethnic instruments. The CX-3 tonewheel organ engine recreates classic Hammond-style sounds with authentic rotary speaker simulation, while the AL-1 provides cutting-edge analog modeling synthesis.

Advanced features include the MOD-7's Variable Phase Modulation synthesis combined with wave-shaping and ring modulation, plus faithful recreations of the MS-20 and Polysix synthesizers through Component Modeling Technology. The powerful arpeggiator system offers four scenes per program with sophisticated pattern and drum sequence capabilities, replacing the Kronos' KARMA system with a more accessible approach.

The 73-key model shares the same 7-inch touchscreen interface and reduced control panel compared to the Kronos, but retains all the core functionality including 16-track MIDI sequencing, 16-track audio recording, comprehensive sampling, and extensive effects processing.

Technical Specifications

Keyboard & System

• Keys: 73-key Natural Touch Semi-Weighted (C-C)
• Velocity sensitive
• Aftertouch not supported (but available as upgrade)

Display

• 7-inch color TFT touchscreen, WVGA (800 x 480 dots)

Sound Generation

• Synthesis Types: 9 engines (SGX-2, EP-1, HD-1, AL-1, CX-3, STR-1, MOD-7, MS-20EX, PolysixEX)
• Maximum Polyphony: 140 voices (HD-1), varies by engine
• PCM Memory: 2GB capacity, 496MB RAM + 2.3GB ROM
• Built-in Libraries: 14 expansion libraries (EXs301-314)
• Wave Sequences: 598 user, 377 preload

Memory & Programs

• Programs: 2,560 user (1,920 preloaded)
• Combinations: 1,792 user (256 preloaded)
• Drum Kits: 264 user (104 preloaded)
• Set Lists: 128 lists, 128 slots each
• Arpeggio Patterns: 2,048 slots (1,593 preloaded)
• Drum Patterns: 1,272 preset, 1,000 user

Effects & Processing

• Insert Effects: 12 (stereo in/out)
• Master Effects: 2
• Total Effects: 2
• Effect Types: 197
• Effect Presets: 783 total

Sequencing & Sampling

• MIDI Sequencer: 16 tracks + master track
• Audio Recorder: 16-track playback, 4-track recording
• Resolution: 1/480
• Sampling: 16/24-bit, 48kHz, up to 80 minutes

Audio Specifications

• Frequency Response: 20Hz-22kHz, +/-1.0dB
• THD+N: 0.01% (20Hz-22kHz)
• S/N Ratio: 95dB
• Dynamic Range: 95dB

Connectivity

• Audio Outputs: Main L/R (1/4" TRS balanced), Individual 1-4
• Audio Inputs: 2 (1/4" TRS balanced, switchable mic/line)
• MIDI: In, Out, Thru (5-pin DIN)
• USB: Type-A (storage/controllers), Type-B (audio/MIDI interface)
• Pedals: Damper (half-damper), assignable switch, expression
• Storage: 60GB SSD (53GB available)

Physical Specifications

• Dimensions: 1,227 x 386 x 116 mm (48.31" x 15.20" x 4.57")
• Weight: 14.6 kg (32.19 lbs)

Power

• Power Consumption: 40W

Key Differences Between Models