I'm looking at the Casio WK 6600 keyboard and see that the old fashioned MIDI connectors are replaced with a USB - B connector. Can anyone answer:

 

1. These connections are okay to connect my linux desktop computer to the keyboard using a standard USB A-B cable?

 2. How long can the MIDI cable be? I suppose if it's too short I could always insert an extension cable?

3. Could I use a real MIDI cable from the computer and convert that to USB?

Thanks!