To control external instruments within ProTools load Scaler on a track and use its MIDI output as the MIDI input of the instrument you wish to control.
How-To
- Load Scaler onto an instrument track and the instrument you wish to control on a second track. To show the MIDI input configuration, right-click on the “Inserts” label and select “Instrument”.
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In the “Instrument” input of the track you wish to control, click the “All” value and select “Scaler Out - all channels”.
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Arm both tracks by holding shift and clicking the “Record” icon and mute Scaler’s track. Both tracks will now receive MIDI but only the controlled instrument will output sound.
- Scaler MIDI output is now routed to your instrument.
PDF version: Scaler - External Instrument Control Setup - ProTools