The Mission Engineering Delta III Si is a distortion pedal that covers three gain types: distortion, boost and fuzz1. It sits in the same family as the Mission Engineering Delta III, and players comparing it against separate distortion pedals, boost pedals or fuzz pedals will want to know how those three stages are arranged inside one enclosure.
What it does
The Delta III Si is not a three-in-one box with independent fuzz and overdrive circuits cascading into one another. Premier Guitar's reviewer described it as a "tri-stage distortion" in the review title, and framed the design as taking a different route from the usual stacked-circuit approach, writing that "a streamlined approach is always intriguing"1.
For a player, that means the pedal is built around one integrated gain design that reaches distortion, boost and fuzz territory, rather than three separate pedals in a single housing. Players who want the more conventional arrangement of independent circuits can look at the Mission Engineering Delta III, or at a dedicated overdrive pedal such as the Mission Engineering Velocity Overdrive1.
Noise
Gain pedals at high settings often bring hiss with them, and the Delta III Si is no exception at its extremes. Premier Guitar's reviewer found1:
"with the right power arrangement the Delta is extremely quiet at all but the most extreme gain settings"
In practice, that points to giving the pedal a clean, dedicated power supply rather than sharing a daisy chain with other pedals, especially if you plan to run it near maximum gain1.
Videos
Brett Kingman
Mobius Guitars
Mobius Guitars
Sources (1)
- Delta III Si Tri-Stage Distortion Pedal Review, Premier Guitar, 2015-10-22





