(IOAudio (ioa_Request 0 IORequest) (ioa_AllocKey 32 . 2) (ioa_Data 34 byte 
. t) (ioa_Length 38 . 4) (ioa_Period 42 . 2) (ioa_Volume 44 . 2) (
ioa_Cycles 46 . 2) (ioa_WriteMsg 48 Message))