How to turn off secondary Audio (SAP) on a DVD recorder.

1. Press the [POWER] button to turn the unit on
2. Press the [FUNCTIONS] button.
3. Press the [▼] arrow to select “Other Functions”.
4. Press the [OK] button.
5. Press the [▼] arrow to select “Setup”.
6. Press the [OK] button.
7. Press the [▼] arrow to select “Audio”.
8. Press the [OK] button.
9. Press the [►] arrow to access the “Audio” menu.
10. Press the [▼] arrow to highlight “Multi-channel TV Sound (Analog)” or "MTS".
11. Press the [OK] button to enter the “Multi-channel TV Sound (Analog)” or "MTS" menu.
12. Press the [▲] arrow to select “Main”.
13. Press the [OK] button to select main and turn off SAP.
14. Press the [RETURN] button repeatedly to exit the menu.

This answer is for the following models; DMR-EZ47, DMREZ475, DMR-EZ48, DMREZ485, DMR-ES30, DMR-ES35, DMR-ES40, DMR-EH75