The Nektar Technology MIDIFLEX4 (sometimes mistakenly searched as “MidiFlex4 Compact”) is a compact 4-port USB MIDI interface designed for flexible routing between computer-based DAWs and hardware MIDI gear.

🔌 What it actually is

It’s a class-compliant USB MIDI interface, meaning:

• Works on Windows, macOS, and iOS without drivers
• Connects via USB to your computer
• Provides 4 configurable 5-pin MIDI ports

🎛️ Key feature: flexible port modes

You don’t get fixed IN/OUT ports. Instead, the MIDIFLEX4 can be reconfigured as:

• 1 IN / 3 OUT
• 2 IN / 2 OUT
• 4 OUT

It can also auto-detect connections and show activity using LED indicators.

🔁 Standalone mode (important)

Without a computer (USB power only), it can work as:

• MIDI merge box (2 → 1)
• MIDI splitter (1 → 3)

So it can route MIDI between hardware synths even without a DAW running.

⚙️ Core specs (quick summary)

• 4× DIN MIDI ports (configurable IN/OUT)
• USB-B connection to host
• Bus-powered (or optional external USB power)
• Aluminum compact enclosure (~11 cm wide)
• Plug-and-play (no drivers needed)

💡 Why people buy it

• Expand MIDI ports for hardware synth setups
• Live rig routing without a computer
• Simple “hub-like” MIDI expansion at low cost

⚠️ One important clarification

Despite the “hub” style expectation, it is not a smart MIDI router/matrix with memory presets. Routing depends on:

• Computer/DAW configuration, OR
• Simple standalone split/merge modes