i was looking on it and i've found the error. Fmod create it's own copy, so it will duplicate memory everytime when u play sound. Use this:
System->createSound((const char*)FSB,
FMOD_SOFTWARE | FMOD_CREATECOMPRESSEDSAMPLE | FMOD_OPENMEMORY_POINT,
&exinfo, &Sound);
instead of this:
System->createSound((const char*)FSB, FMOD_OPENMEMORY, &exinfo, &Sound);