The keyboard I'm using is different than the OP's; it's pretty old (can't even remember when I got it :P), Concertmate 980. I have no other keyboard to test the adapter with.
The adapter is a cheap one from eBay; the user has a store therefore many other people bought the same item. Judging by the user's feedback, other people that bought this adapter have working ones.
The adapter doesn't have a name anywhere on it, but in Windows 7 the driver is automatically found and installed, and the device is called VIEWCON. I found a site, viewcon.net, it's some Chinese company, and I can't seem to find a different driver on the site for the adapter.
Other Google results talk about the adapter not working at all, and people suggest a generic usb midi driver (which works for them), but Windows 7 won't let me install because it says it is the incorrect operating system. They also say to extract the setup file and update the driver manually, but then Windows tells me I have the latest driver already :p
I will continue searching Google but I'll probably just have to get a new adapter I suppose.
EDIT: In midi-ox, if I set up the computer's keyboard to send notes to the electronic keyboard, they play like they should: when I press a letter down, the corresponding note is played on the keyboard, and when I release that letter, the note stops (as it should). I just cannot figure out why it doesn't work like that when going from the keyboard to the PC.
post edited by kotjze - 2010/01/07 18:17:02