OMS must be setup to reflect which MIDI interface and MIDI controller you are using. 1) Install the Software for IK Multimedia's SampleTank. Restart.2) Launch Pro Tools and open a session. 3) Create a Stereo Aux. Input track. File Menu > New Track > Create a Stereo Aux. Input track > Create. Make sure the volume is up for the aux. track.4) In the Mix Window, instantiate the Multi - Channel plug-in for SampleTank. Load an instrument into SampleTank.5) Create a MIDI track. File Menu > New Track > MIDI track > Create. 6) Set the output of the MIDI track to SampleTank instrument, 1.7) Press the record enable button on the MIDI track. Play the keyboard controller and you should get signal into the MIDI and the aux. track and hear SampleTank.