Korg Wavestation A/D Brand New Screen and Battery! Fully tested and working perfectly!
Face is pretty clean. Case has some rack wear (See Pictures). Feet are removed as it doesn't fit in a rack with them on.

The Korg Wavestation A/D is a 2U rackmount digital synthesizer module that expands upon Korg’s groundbreaking Advanced Vector Synthesis and Wave Sequencing technology. Released in 1991, it is widely considered by sound designers to be the most versatile and powerful hardware variant in the entire Wavestation lineage due to its unique ability to accept and process live external audio.
Core Synthesis Architecture

• Advanced Vector Synthesis: Based on technology inherited from Sequential Circuits' Prophet VS, a single patch can assign up to four discrete waveforms (labeled A, B, C, and D). The integrated front-panel joystick or an internal envelope allows users to morph smoothly between these four sources in real time, altering the sonic texture continuously.
• Wave Sequencing: Rather than playing static samples, the Wavestation can cycle through a linear sequence of up to 256 PCM waveforms per sequence. Each step in the sequence can have its own duration, crossfade time, and pitch, resulting in complex, evolving rhythmic textures, glassy pads, or pseudo-arpeggios.
• Filter and Modulation: The architecture uses 32 non-resonant low-pass digital filters, 2 LFOs per patch, 32 ADSR envelope generators, and a comprehensive internal modulation matrix.

The "A/D" Advantage & External InputsThe defining feature of this specific model is its stereo analog-to-digital (A/D) inputs located on the back panel (featuring both XLR and 1/4-inch connections). [1, 2]

• Audio as an Oscillator: External audio sources (like vocals, guitars, or other synthesizers) can be routed directly into the synth engine and assigned to one of the vector points (A, B, C, or D). You can literally use the joystick to morph between a live microphone input and an internal synthesizer patch.
• Stereo Vocoder: The A/D input enables a powerful built-in vocoder. This became a signature vocal sound used extensively in mid-1990s electronic and R&B music productions.

Summary of Technical SpecificationsFeature Specification
Form Factor 2U Rackmount Module
Polyphony 32 voices
Multitimbrality 8-part multitimbral (8 Patches per Performance)
Waveform ROM 4 Megabytes (Includes the upgraded EX library with 396 total waves)
Effects Engine Dual independent digital multi-effects processors (up to 55 algorithms, including chorus, delay, reverb, and pitch shifting)
Expression Support Full MIDI implementation, channel aftertouch, and compatibility with polyphonic aftertouch

Audio Inputs
The standout feature of the A/D version is its dual-channel analog processing setup:

• 2 x 1/4" Phone Jacks (Input 1 & Input 2): Balanced/unbalanced line or microphone level inputs.
• 2 x Input Gain Switches: Dedicated rear hardware switches to toggle between -40dB, -10dB, and +4dB operational levels.
• 2 x Rotary Input Level Knobs: Located on the back panel to manually adjust incoming audio gain.

Audio Outputs

Unlike the standard keyboard models, the A/D includes professional studio XLR options:

• 2 x Balanced XLR Outputs (1/L & 2/R): Designed for direct connection to professional mixing consoles or studio monitors without needing a DI box.
• 4 x 1/4" Phone Jack Outputs (1/L, 2/R, 3, 4): Assignable separate hardware buses. Output pairs can be used as individual stereo stems or split for multi-channel quadraphonic and surround-sound audio routing.
• 1 x 1/4" Stereo Headphone Jack: Located on the front panel for monitoring.

Data & Expansion Slots

• 1 x PCM Data Card Slot: Front-panel expansion slot for inserting Korg PCM sample voice cards.
• 1 x PROG Data Card Slot: Front-panel expansion slot for saving or loading custom user Performance, Patch, and Wave Sequence data.

Control & Synchronization

• MIDI Trio: Standard 5-pin DIN ports for MIDI In, MIDI Out, and MIDI Thru.
• 1 x 1/4" Foot Pedal Jack: Assignable expression controller input.
• 1 x 1/4" Foot Switch Jack: Assignable sustain or program change footswitch input.