Question

I would like for it to be a way to send MIDI Clock out to an external keyboard so that the Arpeggiator can be synced to the tempo in Studio One the same way I can do in Pro Tools. Thanks!

Answer 1

This feature already exists in Studio One. 

• Open MIDI Properties for your your MIDI Output: 
• Click on Studio One in the ToolBar, then select Options (or hit Control and Comma)
• Then click on External Devices and select the MIDI Device for the Output you want to send Sync from and click Edit. 
• Then Check the box the appropriate box:

You can choose to send MIDI Clock to this Instrument and/or use MIDI Clock Start by checking the appropriate boxes. You should send MIDI Clock to your Instrument if it 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.

(source: http://support.presonus.com/hc/en-us/articles/210044153-Studio-One-How-do-I-setup-a-hardware-keyboard-synthesizer-in-Studio-One-) 

For your application you don't need to select MIDI Time Code. If you want to learn more about MTC, read this article online. 

Answer 2

I will say, I’ve tried this and higher audio buffer settings effect the midi clock start signal rendering it unuseable as a feature.  Unless they’ve fixed it recently.  Between this issue and the fact that the sustain pedal info glitches constantly for me, I had to go back to using Cubase for anything requiring my drum machines and syncing keyboard midi clocks.