What are the US-428’s F-keys for?
The F keys are application-specific keys, and can be programmed to address functions of your chosen software. For example, in the bundled Cubasis VST application, F1 will open the audio mixer window, F2 opens the FX send window, and F3 toggles between open windows. In ProTools, F2 selects scrub mode and F3 shuttle mode.
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