In case anyone is interested, it is possible to use Windplay on the iMac.
Using a 233 MHz iMac and Virtual PC, Windplay will limp along and sound
almost OK as long as the roll image is turned off. I don't know if you
can get any sampled voices to go with the ensemble or if the noise that
comes with the Windows Media Player is it. Anyway it might work to send
MIDI to a Power Roll or other device. I might try this soon and report
back if there is success. I might have to wait for the expansion
adapter to get a MIDI output. It is supposed to come out this (October)
month???