PCM_N_URBS         21 sound/usb/6fire/pcm.h 	PCM_N_URBS = 16, PCM_N_PACKETS_PER_URB = 8, PCM_MAX_PACKET_SIZE = 604
PCM_N_URBS         20 sound/usb/hiface/pcm.c #define PCM_N_URBS      8