The AKB74815321 remote control came with several different LG soundbar models. The details about the remote control buttons will be in the manual for the sound bar. One of the soundbars that came with the AKB74815321 remote is the LG SH5. You can find the manual on the product support page:
https://www.lg.com/africa/support/support-product/lg-SH5 . The current link to the Owner's manual is
http://gscs-b2c.lge.com/downloadFile?fileId=EYL1r7RwscoCJA55902zQ . See page 7 for the image of the remote control and gives the page number for more information on some of the buttons.
The Sound Effect button, for example, lets you choose between Standard, Cinema or Adaptive Sound Control effects. (ASC analyzes the incoming sound and chooses the effects in real time.) AV Synch can help ensure that the audio isn't offset from the image on the television. The Auto Power button allows you to enable power saving features. These tell the unit to either dim the display or power off the sound bar if no audio signal is received from the source or no buttons are pressed on the remote for a period of time.
I hope this helps.
Cindy Wells
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