For a muted horn sound, leave your tone knob all the way down. Slightly muffle the string with your right palm behind the EBow. A little extra pressure on the EBow helps drive the muffled string. Press the EBow with each note you play. Stay over the HotSpot for the best response. Vibrato adds a vocal quality to the sound.
For a bright horn sound, turn your tone knob up to half or full. Hold a chord as you move the EBow from string to string. Lightly press-and-release the EBow over each string as you cross for a nice brass sound. Cross in a straight line over the HotSpot. Press-and-release a bar chord on the fretboard as you cross to enhance the effect. Minimal use of a volume pedal can also help this imitation.