Many masters exist where surround sound audio is encoded onto two tracks on DigiBeta, HDCAM or HDCAM- SR as DATA. You can not hear that audio without decoding it.
We have over a decade of experience encoding and decoding dolby-E to and from broadcast masters, using genuine Dolby hardware.
Studio 1 is set up to monitor surround sound in 5.1 and we have the dolby emulation hardware, so at the touch of a button we can listen to the same source in any and all of the possible fold-down modes, from 5.1+2, through Dolby ProLogic and Stereo, right down to mono.
If you need to re-purpose an existing program, and need to create a file from legacy tape formats, our studios have tape decks of many formats permanently installed.
Call us on +44 1268 710 900 email: firstname.lastname@example.org