Set the input for your Sonar trackt to channel 7 or 8, being Tone 1 Dry or Tone 2 Dry. Take care to turn off input monitoring of the track, otherwise you will hear a latency-delayed extra sound. On the X3L, choose your 'wet' preset. Take care that you actually hear the sound produced by the X3L itself, by setting the direct monitoring level high enough in the line6 midi devices control panel, accessible via all programs/line6/tools. When playing back, use Podfarm to recreate/edit your wet sound.

Alternatively: set the direct monitoring level to zero, and use the monitoring of the Sonar track, including the Podfarm effect. But, personally, I think latency prevents a natural playing feel using this setup.

Hope this helps.