This function seeks for an ACM device.
DWORD ACM_Seek( DWORD dwOpenData, long pos, DWORD type );
The Wave API Manager never calls the ACM_Seek function, so this routine may be empty and have an arbitrary return value. ACM_Seek is a required stream interface driver function, but the function ACM_IOControl handles all data communication. The ACM Driver Wrapper library (Acmdwrap.lib) always returns -1.