Audiovox VM9423 Reference Manual page 7

NORMAL or Standby (screen off).
NOTE: Only CINEMA and Standby are available for non-video sources.
8. Press to silence the receiver. Press again to resume previous volume level.
9. Point remote control at IR Receiver to control functions.
10. Press to play the previous chapter/track or auto-search the previous available
radio station. In menu mode, press to move the cursor to the left.
11. Press to slow forward/slow reverse disc or tune down one frequency step in tuner
mode. In menu mode, press to move the cursor down.
12. Use thin metallic object to depress RESET button and restore factory default
settings.
13. Press to pause or resume playback or to confirm current selection.
14. Press to access the next chapter or track or auto-search the next available radio
station. In menu mode, press to move the cursor to the right.
15. Press to fast forward/fast reverse disc or tune up one frequency step in tuner
mode. In menu mode, press to move the cursor up.
16. Press to control intro playback function.
17. Touch the TFT to control head unit functions.
18. When the NAV102 is connected to the head unit, press to display the navigation
user interface.
19. Press to control repeat playback function.