Using volume pedals on some of the sound sources, he filtered sounds in and out of the mix without doing anything on the guitars.
When an organist moves an Expression pedal it affects both the volume and frequency envelope of the affected pipes.
The Voix celeste is located in the swell organ on British and American organs and in the Récit expressif on French organs.
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He also uses a wide variety of effects, including an envelope filter expression pedal, wah pedal, a Line 6 tap delay, a Roland GR-55 guitar synth, a Line 6 M13 Stompbox Modeler Guitar Multi Effects Pedal, and a Talk Box.