PRESONUS AudioBox Stereo Quick Start Manual page 281

• When editing the control map for a Keyboard device (MIDI Learn enabled), you can
select Transmit Value from the contextual menu for each control. This option will send
parameter updates for a given hardware control out of the Keyboard device's MIDI Out
port when the software parameter to which the control is linked changes. This makes
it possible for user-created Keyboard devices that have soft controls (endless rotary
encoders with LED indicators, motorized faders, etc.) to reflect the correct current state
of any parameter that is being controlled. (This option is also available for Control
Surfaces.)
• When you have mapped all of the desired controls, click on the MIDI Learn button to
exit MIDI Learn mode.
Now that the hardware controls for your device have been mapped, they can be used to
control almost any software parameter, as discussed in
Device control maps are global in Studio One and are used across every Song, so you will only
need to map your device once.
When using predefined devices from the External Devices menu, it is not possible to map new
controls for the device. You must follow the instructions in the Add Device window (for
example, select a certain preset).
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Control Linking below.