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MOTU MIDI Express 128

Rackable USB MIDI interface with eight independent MIDI inputs and eight outputs. It carries MIDI data and provides no audio converter or audio interface.

Photograph of MOTU MIDI Express 128
PHOTOGRAPH — Paia-stuff,_drumstation,_proteus_fx_-_front.jpg: *Paia-stuff,_drumstation,_proteus_fx.jpg: mikael altemark derivative work: Clusternote (talk) derivative work: Clusternote (talk), CC BY 2.0 · FILE ON WIKIMEDIA COMMONS

IDENTIFICATION: Match the complete printed model, revision, bundled breakout, and accessory markings. Specs below describe this named model; family-level variants are not assumed interchangeable.

Specifications

Catalog subcategoryMIDI interfaces
Product IDMOTU MIDI Express 128 USB MIDI interface
Bus / hostUSB host interface; refer to the Express 128 manual and actual accessory package for power requirements. Do not presume the unit operates standalone.
Connectors and I/OEight 5-pin DIN MIDI IN ports and eight 5-pin DIN MIDI OUT ports, giving 128 channels of MIDI. No analog audio or MIDI Thru ports are implied by the eight-port count.
Chipset / conversion / protocolMIDI interface only; no audio ADC/DAC. MOTU MIDI Time Stamping and multi-client behavior depend on OS/driver. It does not operate standalone without a host.
Drivers / operating systemsMOTU provides Mac Core MIDI and Windows drivers/software; current OS compatibility must be verified on its model download page. Do not treat it as class-compliant unless the model manual explicitly confirms that mode.
Variant compatibilityMIDI Express 128 is distinct from MIDI Express XT and Micro Express; verify eight physical inputs and outputs on the chassis. Check USB connection and supplied power/host arrangement per manual.

Service & preservation

Inventory all 16 DIN ports and label connected instruments before moving a rack. Preserve USB/driver version and routing map; inspect DIN sockets, chassis, and power/USB connections. Test each port independently because a failed cable can mimic interface failure.

Identification and compatibility checks

  • Photograph the product/model label, board silkscreen/revision, connector faces, cable assemblies, and accessory part numbers before installation.
  • Check electrical bus and host slot or USB/MIDI protocol support against the exact manual; connector shape alone does not establish compatibility.
  • For analog I/O, confirm line/mic/instrument level, phantom-power behavior, channel map, and direction from the model-specific documentation before connecting equipment.
  • When software or driver support is uncertain, preserve the last known-good installer and document tested host OS, driver version, and device identifier.

Primary manufacturer & standards sources

  1. MOTU MIDI Express 128 official product pageManufacturer page identifies the 8-in/8-out interface and host configuration.
  2. MOTU USB MIDI Interface User GuideManufacturer manual covers USB MIDI interface configuration and operation.
  3. MOTU official downloadsCheck the MIDI Express 128 model-specific driver/software and OS release notes.

Source selection is model-specific where an original manual or vendor product/support page exists. Archived scans preserve manufacturer documentation; operating-system claims are limited to what the cited product/manual materials identify.