[milesyoung]

Hi,

If you are routing the whole signal through an external unit, select the appropriate output on the channel strip (rename your ins and outs with meaningful names in the "I/O Setup" for an easier life).

Then add a new AUX track and set the input of the AUX track to come from the external unit. Then you'll hear the resulting signal.

If you don't want the whole signal to go through the external device, leave the output of the track alone, and select the external device/Digi001 OUT in one of the Sends (underneath the plugins). You'll still need the AUX track to monitor the returned signal though.