About
Mcp Koii is an MCP server that lets you control the EP-133 K.O. II sampler through natural language or text-based drum patterns, using MIDI over USB and integrating with Claude.
Capabilities

The MCP Koii server bridges the gap between natural‑language AI assistants and the Teenage Engineering EP‑133 K.O. II sampler, enabling developers to command a physical MIDI device through simple text prompts. By exposing the sampler’s capabilities via the Model Context Protocol, Claude or any MCP‑compatible client can query available MIDI ports, establish a connection, and instruct the device to play individual notes or complex drum patterns—all without writing custom code.
At its core, the server translates high‑level textual instructions into standard MIDI messages that the K.O. II understands. It supports “note on/off” events for pads spanning C2–B5 (MIDI notes 36‑83) and offers a text‑based drum pattern syntax that accommodates multiple reference styles: pad labels, raw MIDI note numbers, sound names, or a mix of any. This flexibility lets developers craft concise patterns—such as “kick on beats 1 and 3, snare on 2 and 4”—and have them rendered in real time by the sampler.
Key capabilities include:
- MIDI port discovery and dynamic connection management, allowing seamless switching between devices.
- Single‑note playback with adjustable velocity and duration for precise control over individual sounds.
- Pattern and drum‑pattern execution that can trigger several instruments simultaneously, supporting layered percussion arrangements.
- Sound browsing utilities, such as listing categories and default pad mappings, which help users understand the sampler’s internal organization.
- Claude integration via MCP, so a conversational AI can act as a live performance controller or rehearsal tool.
Real‑world scenarios benefit developers who build creative applications, educational tools, or live‑performance interfaces. A music teacher could have Claude generate practice drills for students, while a VJ might let the AI orchestrate drum loops onstage. Because the server communicates through standard MIDI, it can also be combined with other hardware or software synthesizers in a modular setup.
What sets MCP Koii apart is its lightweight, text‑centric design that abstracts away the intricacies of MIDI programming. Developers can focus on crafting expressive prompts and integrating them into larger workflows—such as automated rehearsal schedules or AI‑driven composition pipelines—while the server handles the low‑level message routing. This blend of simplicity, flexibility, and native MIDI support makes MCP Koii a powerful tool for anyone looking to fuse AI assistants with tactile music hardware.
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