To use a hardware synth as both a keyboard to record MIDI and also as a sound module, to have Studio One trigger it's sounds on playback, you'll need two separate devices:
- An External Keyboard Device - To play MIDI into Studio One from the synths keyboard, to record.
- This device only requires a Receive From port assignment.
- An External Instrument Device - To send MIDI out to the synth from Studio One.
- This device only requires a Send To port assignment.
- After creating those two devices, go to the browser and look in the External Instruments folder for your instrument device and drag it in.
- Create an Aux Channel for it which will bring its audio output into the Studio One mixer,
- Assign the input of the Aux channel to whatever audio inputs your synth is connected to on your audio device and save it.
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That all there is to it. Whenever you want to use that synth, drag it in from the browser and record,