Help with Capcom vs snk 2 EO

[StartingLine]

I downloaded the us
version of capcom vs snk 2 (usa)
and i played a lot the game
when i changed to arcade mode
on radio mode..

the first round the fight has background music
if i win all the other rounds are without music..

is there a patch for it?
i have burned it several times and teh same problem
happens..