Hi jamesB, and welcome on this board.
You need a DAW to route audio through the Easel.
to route audio you have to
Open the Easel in your DAW
Create an audio track
Route this Audio track to the Easel
then on the easel , set gate 2 mode on preamp , preamp switch on ext.
Raise gate 2 slider and channel B knob,
play a note. It should work.
As cubase elements is a minor version of cubase, maybe it is limited in terms of routing possibilities.
Hope this helps,
best,