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The MSSIAH is a MIDI cartridge for the Commodore 64.
It contains a suite of music applications that starts instantly as you insert the cartridge and start up the computer.
With these applications you can play the C64's audio circuit (SID) via MIDI or stand-alone with the internal sequencers.

MSSIAH is short for MIDI SID Software Integrated Applications and Hardware and means that the cartridge contains both software and hardware to midify the C64. Since they are integrated you won't need hard-to-get MIDI peripherals to hook it up to your synthesizer or sequencer.
Just plug in a MIDI cable and off you go!
With no doubt, the MSSIAH is the cheapest way for you to bring MIDI to your Commodore 64!
However, cheap does not mean less.. MSSIAH is loaded with features that will make the old C64 an irreplaceable tool in your modern recording studio!