Thanks to Manon Miessen, Radio Netherlands Producer, and recording engineer Mark Broer.

NPR: E.S.T. at the North Sea Jazz Festival

Lodge was a recording engineer in a studio in Bayswater.

BBC: Mind the Gap Tube announcement returns after wife's plea

During his planned sabbatical, he booked himself a recording studio with an engineer.

NPR: Kele: From Bloc Party To The Dance Floor

Of course, good sound is subjective, so the app sets a concrete metric: It attempts to replicate exactly what an audio engineer hears inside a recording studio.

WSJ: Studio Sound to Go | App Happy