After scoring a full orch. arrangement (strings, reeds brass, perc.), I exported a wav file thru "auidio" and the arrangement came out  fine as scored.  I went  to  MIDI/audio, hit the "re-arrange instruments" button, pressed the "yes" option, generating the MIDI icon my desktop.  When I hit "play" I heard a confusion of sounds with some percussion instrument sounding thru the part designated for piano. I need help.  My system is Windows  10 and the software is the latest Fimale V.