PRESONUS AudioBox Stereo Quick Start Manual page 144

has a built-in sequencer or components (such as LFOs) that need to sync to Studio
One. Enabling MIDI Clock Start will send MIDI Clock Start signals to your Instrument.
6. Finally, you can choose to send MIDI Time Code to this Instrument. You can set a
Display Offset under Song/Song Setup/General to correct for time-code variances with
external devices.
Your External Instrument is now available for use in any Song. To use an External Instrument in
a Song, be sure that an Instrument Track is routed to it and that the appropriate Audio Tracks
have been added and configured. Refer to
topic.
Note that if your External Instrument is also a controller (such as a keyboard workstation), you
need to set it up twice. First, set it up as an External Instrument without a Receive From
selection, and then set it up as a Keyboard, without a Send To selection. This allows the
keyboard-controller section of the workstation to be used as a source for Instrument Tracks,
while allowing the synthesizer section to be used as an External Instrument.
4.4.3 Set Up Control Surfaces
In Studio One, a Control Surface is a hardware device that includes transport controls, faders,
and other specialized controls. The control surface might use MIDI directly or via a special
control layer such as Mackie Control.
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Monitoring an External Instrument for more on this