A company which, in the 1980s, offered a variety of add-on products for synths. Some of these were kits to add MIDI capability to pre-MIDI synth designs; others did things like expand patch memory or add additional filter capability to existing synths. A notable product was the "gen mod" for the Mark I version of the E-mu Emulator, which, as it came from the factory, had little performing capability beyond the ability to trigger samples and play them back at a desired pitch. The gen mod added voltage controlled filters and amplifiers to the Emulator; one big benefit of this was control of the dynamics and duration of the played samples, instead of just playing a sample to the end each time a key was pressed.