-uint8_t ao_lco_min_box, ao_lco_max_box;
-uint8_t ao_lco_selected[AO_PAD_MAX_BOXES];
-uint8_t ao_lco_valid[AO_PAD_MAX_BOXES];
-uint8_t ao_lco_channels[AO_PAD_MAX_BOXES];
-uint16_t ao_lco_tick_offset[AO_PAD_MAX_BOXES];
+static uint8_t ao_lco_channels[AO_PAD_MAX_BOXES]; /* pad channels available on each box */
+static uint16_t ao_lco_tick_offset[AO_PAD_MAX_BOXES]; /* 16 bit offset from local to remote tick count */
+static uint8_t ao_lco_selected[AO_PAD_MAX_BOXES]; /* pads selected to fire */