used to be, microsoft had a generic usb midi device driver that worked. It seems this does not exist/does not work yet in win 7. Moog always relied on this generic driver for all USB-MIDI.
Windows 7 did not succeed to send firmware to MP-201 either, had to do it on a Vista system. So far for their claim about compatibility with Vista drivers.
I tried the yamaha drv- no luck
it says “no device found”-
maybe it needs some yamaha hardware
to install with, and then, perhaps, it might
cover some other devices as well?