The Main MIDI Input Port pop-up menu lists all MIDI devices that are installed on your system.
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Select the MIDI device that you want to use from the pop-up menu.
The MIDI activity LED on the left indicates incoming MIDI messages via the selected MIDI input. The LED lights up on receiving note-on and controller messages. This way, you can check if HALion and your MIDI keyboard are connected to the same MIDI device input.
The Audio Output Ports pop-up menu lists all outputs of the selected ASIO device.
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Select the audio output that you want to use as the main stereo channel of the plug-in from the pop-up menu.