Korg KRONOS X - MUSIC WORKSTATION (2012–2022)

At 40.79 pounds, it doesn't travel light. What it carries is an entire studio in a brushed metal chassis.

Overview

The Korg KRONOS X - MUSIC WORKSTATION arrived in 2012. It wasn't built for sleek minimalism or retro charm. It was built like a command center: dense, serious and complex. This 73-key variant has full-sized piano-weighted keys and aftertouch, and it targets players who want expressive control without the full 88-note span. It isn't portable. It runs on AC and is meant to sit at the center of a studio or stage rig.

The KRONOS X has nine sound engines: SGX-1 for acoustic piano, EP-1 for vintage electric pianos, HD-1 for classic PCM synthesis, AL-1 for analog modeling, CX-3 for tonewheel organ, STR-1 for physical modeling strings and plucked instruments, MOD-7 for FM synthesis, and emulations of the MS-20EX and PolysixEX synths. Each has its own voice architecture and strengths. A Sound On Sound review noted that although the MOD-7 engine dragged polyphony down to just five notes under heavy loads, the results were fabulous, with FM tones of unprecedented clarity and presence. The system's 200-note polyphony is a shared pool, but engine-specific limits exist. CX-3 hits 200 voices, while STR-1 maxes out at 40.

It's a workstation through and through. The onboard 16-track playback and 4-track simultaneous recording in WAV format (16- or 24-bit) mean you can produce a full song without a computer. MIDI and USB connectivity allow integration with DAWs, but there's no tablet control. There are no built-in speakers, no battery power and no soft pedal input. It expects external monitors, a solid power source and a sustain pedal. Audio input is there too, and not just for monitoring. Six channels of input (2 analog, 2 digital via S/P DIF optical at 48 kHz/24-bit, and 2 USB) let users route external audio through the VPM oscillators and filters in real time. Synth nerds still geek out over that one.

It doesn't coddle. No tutorials are built in. The learning curve is steep, and the interface, while comprehensive, demands time. For those willing to dig, it offers deep sound editing, accompaniments, and a file system that supports both Korg's proprietary formats and standard SMF 0 and 1.

Specifications

Key Features

Nine Integrated Sound Engines

The KRONOS X hosts nine synthesis methods. The SGX-1 engine delivers high-resolution piano samples with detailed velocity layers and pedal noise, making it a favorite for acoustic realism. EP-1 models classic Rhodes and Wurlitzer tones with amp and speaker simulation. HD-1 taps into PCM-based synthesis for pads, brass, and digital textures reminiscent of the 1980s and 1990s. AL-1 provides virtual analog oscillators, filters, and modulation routing for subtractive synthesis. CX-3 recreates the spinning Leslie and drawbar nuances of a Hammond organ. STR-1 uses physical modeling for strings, guitars, and mallet instruments, with real-time control of bow pressure or pluck position. MOD-7 brings FM synthesis into the modern era with a clear, punchy sound that reviewers noted was unlike any previous FM implementation. The MS-20EX and PolysixEX engines recreate Korg's own analog classics, complete with filter distortion and resonance quirks.

Dual Multi-Mode Filters per Voice

Each voice on the KRONOS X gets two multi-mode filters, configurable in parallel or series, with a dedicated 24 dB/octave (4-pole) mode. That allows layering a low-pass with a band-pass, for instance, or stacking two resonant filters for aggressive sweeps. The filter architecture supports both analog-modeled and digital characteristics, depending on the engine.

Real-Time Audio Processing via VPM

One of the more esoteric features is the ability to route external audio through the VPM (Variable Phase Modulation) oscillators and filters. A vocal, guitar, or any line-level source can be fed into the Kronos and processed with the same modulation and filtering used for internal synthesis. That makes the workstation a dynamic effects processor, capable of FM-style modulation on live inputs or filtering through the CX-3's organ-derived resonant stages.

Doubled Internal Memory and SSD

Compared to the original 2011 Kronos, the Kronos X doubled the internal memory and SSD capacity. Exact figures aren't in the fact sheet. The upgrade was critical for handling the HD sample libraries introduced with the version 2 OS update. More memory meant faster loading, smoother multitimbral performance, and the ability to run more complex multitimbral setups without voice stealing.

73-Key Piano-Weighted Keyboard with Aftertouch

The 73-key version sits between the 61-key portability and the 88-key grand piano experience. The keys are full-sized and piano-weighted, which gives a realistic playing feel for pianists and keyboardists who need dynamic expression. Aftertouch allows modulation, vibrato, or filter sweeps via pressure. It lacks inputs for soft or expression pedals, so pedal control is limited to sustain only.

Historical Context

The KRONOS music workstation was first unveiled in 2011 as Korg's flagship. The Kronos X followed in 2012, coinciding with version 2 of its operating system, which enabled HD sample library support. It was part of a lineage that included the OASYS, sharing file compatibility and some engine architecture. The product family expanded to include 61- and 88-key variants. A major redesign arrived in 2015 with the Kronos 2, featuring gold-plated audio jacks and further refinements. Production of the Kronos line ended in 2022, a decade-long run.

Collectibility & Value

No original MSRP is documented in the fact sheet, though RRP was listed as $4600 in early sources. Current market value isn't specified, but owners advise favoring the Kronos X or Kronos 2 models due to their doubled memory over the original. Reliability is generally solid, though reports exist of units shutting down after a few minutes - sometimes attributed to "kernel panic" scenarios linked to firmware issues, corrupted files, or hardware faults. One user reported a problem resolved by disconnecting a second USB device and rebooting. Recovery procedures exist, including system reinstallation, so failures aren't always fatal. No common component-level failures (e.g., capacitors, power supplies) are documented in the provided sources.

eBay Listings

KORG KRONOS X-73

$1,790

Korg Kronos 2 61 Keyboard Synthesizer

$1,950

Korg Kronos 3 73 Music Workstation Keyboard

$3,040

Korg Kronos X 88-Key Keyboard Synthesizer Music Workstation

$1,940

As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.

Related Models

• Korg Electribe EM-1
• Korg Karma
• Korg Trinity
• Korg Triton Extreme
• Korg Triton Le (2000–2002)
• Alesis Fusion 6HD
• Alesis Fusion 8HD
• Casio CT 201
• Casio CT 6500
• Casio CT 701