Somebody asked for it, so it might be useful to others...
If you want to convert a series
of MIDI files with Mid2Wav4, supposing
this program to be in your application search path and your operating system
to be Windows XP1, create a Windows command
file (.bat text file) containing the following line
for %%f in
(%1) do mid2wav4 44100 /S <%%f >%2\%%~nf.wav
and launch it with two parameters:
the source files specification
(including wild card characters)
the destination directory
(not back slash terminated)