Here's a close up look at a classic record and cart operation.

Radio in the 60's with two turntables, a stack of records and a couple of Spotmaster cart machines for commercials and jingles.

A real line from an actual WBYG promo:
Were Number Two!

Danny Coleman 

This button was made up just before the Bryan Street studios burned.  

The WBYG Gates board

The WBYG board was a four pot Gates. The white knob on the right was for the studio microphone. Next to the right was the control room microphone. The next two pots handled most  everything else; turntables, Mutual network, 

To cue records, tape machines, the network, whatever, you selected the source for one of two pots, then turned the pot fully counter clockwise..

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Western Electric Mic

Gates turntable