vMix Live Production Software Pro - Manual (Page 116)

vMix User Guide
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To quickly select the Key or Control you wish to assign this shortcut to, click the Find ... button
and then press or move the control you wish to use.
MIDI Note: If using a MIDI controller, make sure it has been plugged in and turned on before
starting vMix.
Then from the Shortcuts tab in Settings click the MIDI Settings button to enable the device.
Function
Click the arrow next to the Function dropdown box and the Select Function window appear with a number
of commands or macros to choose from, organised by category.