Their first product was the T-Rex BigFoot MIDI footboard, followed by the T-Rex Mac1 MIDI-to-analog controller.
The first line of guitar effects consisted of 4 pedals: the Alberta, Mudhoney, Comp-Nova and Tremster. After these initial 4 pedals came the Replica delay pedal. Their sixth pedal was the BetaVibe chorus pedal. Released in 2003, the BetaVibe was ultimately discontinued.
Alongside its product development, T-Rex Engineering offers Scandinavian distribution of products for GeorgeL's (cables, plugs, and strings).