sentences:  Almost all current release cinema prints are of this type and may also include SDDS data and a timecode track to synchronize CD-ROMs carrying DTS soundtracks.The simplest way of converting existing projectors is to add a so-called "penthouse" digital soundhead above the projector head.However, for new projectors it made sense to use dual analogue/digital soundheads in the normal optical soundhead position under the projector head.