So, you may need to use another piece of software to play the midi files with - I use Vista, so I play back midi files through Sibelius which allows you to set your midi devices. These are the USB midi drivers for Windows of all types: Additionally, you can't choose the playback device for midi files using Windows Media Player in Vista (it's OK before that). What operating system are you using? If it's Vista, there have been lots of problems with midi implementation and USB midi drivers. If it still doesn't work, it's time to call the Kawai technical support. At this point, you're trying to rule out the possibility of a defective cable.
If it still doesn't work, then try using another USB cable. If your DP didn't really come with a CD containing the USB driver, try visiting Kawai's website and see if you can download the USB driver from there. It shouldn't be any different with other manufacturers when it comes to providing appropriate drivers for their DPs. I don't have a Kawai CA 91, but I do have a PX-320 which came with a CD containing the USB driver needed for installation into a PC for proper USB functioning and recognition of my DP. But I thought It was suitable for Mac as for other Digital Pianos, there is no need of drivers for Mac (Casio, etc). May be the problem is that the usb port on the Kawai is only for Windows (there are only drivers for Windows at Kawai website). Tomorrow monday i'll buy a Midi to usb cable, instead of a usb to usb. Interestingly enough, on our own POS system we have one register with a 3550 that works fine with the Windows driver, but it runs Windows 98. The machine I'm having spacing problems with is running Windows XP Pro. If I use the OPOS driver it prints single spaced but it will not form feed at the end of the receipt, forcing me to pull the receipt up about an inch before tearing it off. I've tried both the 35 Windows drivers and they both print double spaced. When I hook the 3550 up, if I use the Windows printer driver it prints all the receipts double-spaced. Whether via MIDI In/Out or using USB-MIDI).
You might also want to check the manual of your Kawai DP to see if you need to do some adjustments in a particular setting as to which data transmission route you would be taking (i.e. If you have installed the USB driver and your PC still doesn't recognize your DP, try another USB port (usually there's 4 or more USB ports in newer motherboards) to rule out the possibility of a malfunctioning USB port. Did your Kawai CA 91 come with a CD when you bought it? Usually a manufacturer would provide a CD which contains the USB driver (and some 'bonus' software) that needs to be installed into your PC for proper recognition upon connection of your DP to your PC.
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