CtlSnapShotDiffersAt 87 sound/usb/usx2y/usbus428ctldefs.h int CtlSnapShotDiffersAt[N_us428_ctl_BUFS]; CtlSnapShotDiffersAt 209 sound/usb/usx2y/usbusx2y.c us428ctls->CtlSnapShotDiffersAt[n] = diff;