Problem is csound doesn't recognize program changes (message 
type 0xcN, where N is the channel number).  So, in order to
get MIDI files to drive csound you'll have to manually remove
these messages and add their delta times to the delta times
of previous non-program-change messages.  

Or go fix the csound sources.  :)

Attached you will find the test material:  midiin.{orc,sco} 
and {no,}progch.mid

Then run 

  csound -F noprogch.mid -o dac mididin.{orc,sco}


-Tobias