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This refers to a device that is “plug and play” – it can be plugged directly into a computer or other host and immediately be recognized without additional drivers needing to be installed. This comes up in the modular world with MIDI to CV/Gate interfaces that use USB: If your converter is a USB Host, and you plug a class compliant USB Device such as a controller keyboard or fader panel into it, the converter will recognize it.

The trick is what to do if you want to plug one USB Host – such as a MIDI/CV converter – into another host, such as your computer. In that case, your converter either needs to have a separate USB Device mode (like the Synthesis Technology E620, which has two different USB connectors), or you need a host-to-host converter such as the iConnect MIDI+.

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