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Main Source and Sub Source Rails
The Main Source Rail shows the active channel, this is the Live output. The active channel will appear as the
Program Output (PGM). You can switch from one channel to another directly on the Main Source Rail, you
will see the PGM Output switch as you press different keys along the rail.
The Sub Source Rail shows the Cued channel, this channel will appear in the PST preview window.
N.B. The keys on the Main and Sub Source Rails will be inactive while the T-Bar is active. Only when
the T-Bar is fully up or fully down will the keys respond.
In the example above Channel 2 is LIVE and Channel 3 is Cued.
When you perform a transition with the TAKE key or the T-Bar you will see the Live and Cued channels
swap places. So in below example Channel 3 has become Live, and Channel 2 is now Cued.
