Hello,
 I found a great MIDI Retrofit for the MonoPoly. Its produced by Mungo
 Enterprises in Australia.
http://home.netspeed.com.au/aistorm/midiretrofits.html
 The retrofit has a sysex programmable offset, so the keyboard can start
 at any key number you like.The retrofit is available either as a
 shortform kit for $50 (PCB + microcontroller) or a fully assembled and
 tested unit for $225. The shortform kit requires about $20-30 worth of
 parts to be purchased for it and takes about 2 hours to
 build.
 I will order at least two - one for the Monopoly and one for my SH-101.
 Best regards, Florian
 PS: I can recommend John Pillans (the man behind Mungo-Enterprises); I
 bought already some of his incredible Mungo-Syncs.