M-tron is a software created by the Gforce software developers, that emulates the sound of a Mellotron

Mellotron

The Mellotron is an electro-mechanical, polyphonic tape replay keyboard originally developed and built in Birmingham, England in the early 1960s. It superseded the Chamberlin Music Master, which was the world's first sample-playback keyboard intended for music...

 instrument.

This program functions with Windows as well as Mac OS

Mac OS

Mac OS is a series of graphical user interface-based operating systems developed by Apple Inc. for their Macintosh line of computer systems. The Macintosh user experience is credited with popularizing the graphical user interface...

, as a plug-in (RTAS

Real Time AudioSuite

Real-Time AudioSuite is a format of audio plug-in developed by Digidesign, currently Avid Technology for their Pro Tools LE, and Pro Tools M-Powered systems, although they can be run on Pro Tools HD and Pro Tools TDM systems. RTAS plug-ins use the processing power of the host computer rather than...

, VST

Virtual Studio Technology

Steinberg's Virtual Studio Technology is an interface for integrating software audio synthesizer and effect plugins with audio editors and hard-disk recording systems. VST and similar technologies use digital signal processing to simulate traditional recording studio hardware with software...

) or a stand alone program.

It is also the name of a LEGO

Lego

Lego is a line of construction toys manufactured by the Lego Group, a privately held company based in Billund, Denmark. The company's flagship product, Lego, consists of colorful interlocking plastic bricks and an accompanying array of gears, minifigures and various other parts...

subtheme within the Space theme. Its name came from its extensive inclusion of magnets, and story-wise, its antagonist was Blacktron II.