I bought a 49 key MIDI controller at a rummage sale for $5. It works (I hooked it up to a sound module and it sends all the on, off, bend & modulation signals) and it appears in very good shape. The lady bought it for her kid and when she realized it didn't make any sounds it sat in a closet for several years.
So while it's cool that I got a pretty good deal - there is no paperwork, so I'm struggling with some of the deeper applications. I did a web search and only got one hit (a guy on my space talking about how he used a MK4902 for creating some music on his computer).
As near as I can teel, this thing is probably vintage "late 90's" - but it appears Midisoft is no longer in business.
So - does anyone have any experiance with a MK4902, made by a company called Midisoft - or have any idea where I could look for an instruction book???