Creating Multi-Channel Surround Masters

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Multi-channel surround sound mix stems and print masters are typically recorded to modular digital multitracks such as the Tascam DA-88 or MMR-8. There are three common layouts for recording to 8-track machines.

The common abbreviations used for each speaker channel are as follows :

L. Left
C. Center
R. Right
Sw. Subwoofer or LFE
Ls. Left Surround
Rs. Right Surround
Lt. Left Total ( Total means phase-matrixed result of Dolby Stereo or Pro Logic, the total of both left and part of the surround and center channels. When decoded, the two tracks make four: L, C, R, and S.)
Rt. Right Total

Following are three common layouts for 8-track print master tapes:

The ITU-R format . L, C, R, Sw, Ls, Rs, Lt, Rt, where the first six tracks are for Dolby Digital and the last two tracks are encoded Dolby Stereo or Pro Logic.
Dolby SR-D . L, Ls, C, Rs, R, Sw, with Lt and Rt on 7 and 8.
L, C, R, Ls, Rs, Sw, Lt, Rt.

Practices may vary. Be sure to use the specified format from a production coordinator or mastering facility. With an 8-track master tape, all standard formats are covered, including Dolby Digital, Dolby Stereo/Pro Logic, stereo, and even mono.

As most MDMs will support machine control and synchronization via MIDI time code, recording a multitrack master is similar to recording to a VTR. The MDM can be synchronized to Pro Tools, ensuring time code accuracy, and the two can be clocked together via digital audio connections.

Documentation of the master tapes is crucial. Figure 9.4 shows Dolby Laboratories' Mix Data Sheet, which can be used to clearly document the masters you create.

Figure 9.4. Dolby Laboratories Mix Data Sheet, which is used to provide accurate information regarding multi-channel master tapes.

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