Viacom Inc. - Media Delivery Technical Specifications for US Network Operations.
"If neither SAP nor DVS are delivered, a mono mix of channels 1 and 2 must be delivered on Channel 3 and 4. Note: It is NOT acceptable to copy the Channel 1&2 stereo mix to Channels 3&4 - rather, a mono sum of 1&2 must be created and delivered on 3 and 4. This is to ensure that viewers who listen to SAP audio receive a complete audio service on their mono SAP signal, not simply “half” of a stereo signal."
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