Three files must be installed to utilize the .MID portion of AudioStation: 
"orch.exe", "orcheng.dll" and "vctl.dll". 

Sound card drivers must be installed correctly for the sound card to be able
to play .MID files.  (This can be tested with Media Player.)

Windows MIDI settings must be set to the correct values for the sound card. 

In the Windows directory, the file "audiosta.ini", under [MIDI Player], 
must reference the correct path to the "orch.exe" file.

Contact the soundard/hardware manufacturer for further information.