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NLS Other Writings

Art and Science of Audio Book Production

Issued September 1995

Running Masters

A running master is a composite recording made from two consecutive original masters. It has a four-track format and can be a cassette or open-reel tape. Running masters should be the signal source for general duplicating purposes, rather than original masters, so that original masters are not put at risk.

Running masters are usually made on a custom-engineered duplicating system. Two consecutive original masters are played simultaneously on twin half-track, two-channel master decks. The output from the two master decks is fed to a four-channel copy transport to produce a running master.

The three versions of this system used in the field to produce running masters are:

    1. RRX open-reel masters to open-reel copy
    2. RCX open-reel masters to cassette copy
    3. CX cassette masters to cassette copy

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Posted on 2014-12-02