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The TX 520 provides two auxiliary busses for monitoring sources without affecting
the on-air sources or those that are pre-selected for the next transition.
Sources for the auxiliary busses are selected from the top row of white buttons on
the source selection panel in the lower console. The AUX SELECT panel buttons
(on the right) let you choose whether sources selected apply to the AUX1 or AUX2
bus.
On AUX1, sources selected can be married or separate audio/video. AUX2 always
has married sources.
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AUX SELECT
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