If you won’t be recording MIDI or playing live from an external MIDI synth it is ok if you don’t have a MIDI Input driver. It just means that an input driver is currently not installed on your computer.
If you don’t have any output drivers listed there, or you don’t see a driver that you suspect should be there (input or output), close Band-in-a-Box and try deleting a file called ‘intrface.bbw’ from the C:\bb folder. This will restore the program’s factory settings. When you next launch Band-in-a-Box, the MIDI Driver Setup dialog should come up automatically. If there are still no drivers there, this means that for whatever reason, the driver isn’t installed on your computer. You can verify this by checking the Windows Control Panel. On Windows 95/98/ME/NT/2000, go to Start | Settings | Control Panel | Multimedia -or- Sounds and Multimedia | MIDI. On Windows XP, go to Start | Control Panel | Sounds and Audio Devices | Audio, and look under MIDI Playback. You will likely need to re-install your sound card or MIDI interface drivers. You can usually download the latest drivers from the manufacturer’s website.
Note that MIDI Output Drivers are different from DXi and VSTi synths. DXi and VSTi synths do not show up as MIDI Output drivers. For example, the VSC-DXi will not show up as an ‘output driver’. To use a DXi/VSTi synth, click the “Use DXi Synth” checkbox and select it in the DirectX Plugins window.