 With the development of faster computers, and better software environments for sampling and MIDI editing, most MIDI mockups today are done with software synthesizers.The replication of acoustic instruments has progressed steadily, to the point where MIDI mockups are occasionally included in the final score on films where time or money has run out, or in low-budget projects.MIDI mockup in the past relied upon hardware ROM samplers (so called Romplers) which stored the audio content.