I got my Audio System Handbook out today to figure out how to turn the clock back, as Winter time starts tomorrow. On page 2-3 there is a Mode Level 2 paragraph It's something about Voice (adjust Voice Activation) Voice Train A, Voice train b and clock set. I followed the directions for Voice and turned it up to 6. My question is what is the voice activation volume and what is voice train A and B about? I could not get the radio to switch to A or B. I know it is not the AVC as I have adjusted that already, but find it only works at speeds over 70mph. Is this radio voice activated??? Also, there is nothing about voice activation in the handbook. Thank U.

PS: I did get the clock turned back an hour.