Connect and install your keyboard/controller/synth in Windows / macOS I don't have any controllers or outboard MIDI devices to connectġ. The most common controllers used by computer-based musicians today connect with a USB cable (rather than MIDI cable) and provide a piano-keyboard, pad or mixer-style interface. For example, hardware and software synthesizers, controller keyboards and 'loopback' devices. This section contains a list of software and hardware MIDI devices on or connected to your system that can be used for MIDI Input/Output. Click the MIDI tab in the System Settings window.