The MD4 4-track digital Mini Disc Multitrack Recorder is a 4-track digital multitrack recorder from the mid-1990s, that uses MiniDisc (MD Data) media instead of cassette tape. It combines a full-featured mixer with digital recording, allowing users to record, overdub, and mix multiple tracks, with minimal noise and no wow or flutter.

The unit supports track bouncing and non-linear editing, enabling more complex productions, despite its four-track limitation. Precise random access and fast locate times, provide a significant workflow upgrade over traditional analog multitrack recorders. Its built-in EQ, MIDI sync capability, and flexible routing make it a popular choice for home studio setups.

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• Type: 4-track digital multitrack recorder (MiniDisc-based)

• Recording Medium: MD Data discs (also supports standard MiniDisc in stereo mode)

• Tracks: 4 simultaneous playback/record tracks

• Sampling Rate: 44.1 kHz

• Frequency Response: approx. 20 Hz – 20 kHz

• Recording Time: ~37 min (4-track), 74 min (stereo), 148 min (mono)

• Mixer Section: Integrated 4-bus mixer with 8 inputs and 3-band EQ per channel

• Inputs: 4× mic/line (¼"), stereo sub-in (RCA), aux return

• Outputs: Stereo out, monitor out, 4× direct outs, aux send, headphones
• MIDI: MIDI Time Code (MTC) support for sync

• Editing Features: Track bouncing, song copy, non-linear editing

• Positioning Accuracy: ~11.6 ms locate precision• Dimensions / Weight: 376 × 72.3 × 364 mm; ~4.8 kg