The Morley Tremonti is a Power Wah modified according to the wishes of Mr Tremonti, who wished for an extra boost of treble.
The Wah combines the typical Morley features (design, electro-optical potentiometers that work quietly and are very reliable) with the sound of the "classic" pedals. So it differs significantly from the other Morleys - just the thing for people who love the sound of Hendrix, Clapton, etc., but don't want to do without the technical advantages of Morley pedals.