MIDI input interface
MuseScore 0.9.5 on winxp sp3 with the ROMI/O by ESI usb midi interface. Installed drivers for the usb midi interface, and it works perfectly in finale (2009), where it's named: "1-RoMI/O MIDI".
I installed PmDefaults, and it sees the following devices:
Default input: 1 [MMSystem]
Default output: M [MMSystem]
When playing my keyboard, the green light in PmDefaults flashes, so I guess this bit works also.
However, in MuseScore nothing happens when I play my keyboard. (and yes: the midi input button is 'on')