HDMI volume will adjust the volume through the receiver. However, when it comes to turning on, it seems that the Apple TV has to turn off the receiver through the sleep function in settings or the receiver has to power off due to inactivity (like after the ATV turns off and the reciever is idle for a while). The volume control always works, even when the Apple TV 4K isn't the active source. The Receiver is set to the 'TV' input, but a button press on the ATV remote changes it to the 'ATV' input. I have a Denon X-3400H and it's kinda weird. With all the devices OFF, a button press on the Apple TV remote will turn all components on. There are no refunds on paid subscription fees. The LG TV is configured with Simplink turned On for the HDMI input. All cancellations will take effect at the end of the current period. You can turn off auto-renewal by going to your Account Settings after purchase. At the end of that period, your subscription plan will automatically renew according to your selected period and payment will be charged to your iTunes Account within 24-hours prior to the end of the current period.
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APPLE TV AUTO TURN ON SERIES