[4] Mastelotto is a pioneer and continuing developer of a mixed acoustic-and-electronic drumming approach which he refers to as "traps and buttons", and which incorporates techniques and methods from rock, pop and electronic dance music styles.

[8] His tenure with Mr. Mister was followed by more session work for bands such as XTC, The Sugarcubes, Hall & Oates, Cock Robin, The Rembrandts, Jude Cole, Eddie Money, Tina Arena, Matthew Sweet, Julia Fordham, Robyn Hitchcock and David Sylvian.

In each of these setups, Mastelotto also took on an extended percussionist role incorporating multiple sound effects, samples and programs (taking on something of the function played by percussionist/"allsorts" contributor Jamie Muir in the 1972 King Crimson).

In conjunction with engineer/programmer Bill Munyon, Mastelotto formed the IDM project BPM&M (which to date has recorded one album, 2001's 'XtraKcts & ArtifaKcts', which featured or sampled many King Crimson members and associates).

The album featured reworked versions of twelve King Crimson songs, deliberately re-arranged in a more popular style in order to accent the group's songwriting and its gentler side.

[16][17] In 2015, Mastelotto joined Carmelo Pipitone (guitarist of Italian band Marta sui Tubi), Lorenzo Esposito Fornasari (singer and keyboard player with Berserk!

Williams of Poi Dog Pondering/Alejandro Escovedo band and Monica 'MonKey' Champion from Baboon Orchestra), and M.P.TU (with Little Feat guitarist Phil Brown, singer Malford Milligan and Spirit/Firefall/Heart bassist Mark Andes).

[20] He has continued to guest with Jay Terrien, Cock Robin, drummer Terry Bozzio, Mecca, Herd of Instinct, Tony Levin and the California Guitar Trio, and has contributed to major network television themes.

In 2007 Mastelotto went on tour with The Flower Kings in Europe supporting their album The Sum Of No Evil, followed by an appearance at the enormous Creation of Peace festival in Kazan, Russia, with Adrian Belew, Tony Levin and Eddie Jobson.