In the case that {HEAD ~ the sound processor} is connected to a plurality of common buses, the bus interface means is also required for {TAIL ~ each} of the common buses 
In the case that { HEAD ~ the sound processor } is connected to a plurality of common buses , the bus interface means is also required for { TAIL ~ each } of the common buses
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH