About audio equipment/connections
If you prefer to use an audio receiver as your sound system instead of or in addition to your TV speakers, the following options provide four common ways to connect:
TV Box by HDMI to the audio receiver with speaker wires to the speakers HDMI from the audio receiver to the TV (only if your TV supports audio pass-through)
TV Box by HDMI to the TV and an optical cable from the TV to the audio receiver with speaker wires to the speakers
TV Box by HDMI to the TV and stereo cables (red/white) to the A/V receiver using the analog break-out cable (or stereo to self-powered speakers)
TV Box by S/PDIF (optical) using a TOSLINK cable to a supported audio receiver or TV. You can use the S/PDIF audio port with either HDMI or analog video connections.
If you are familiar with electronics, you can certainly come up with your own creative way to connect!
When setting up your audio equipment with an HDMI cable, give the cable a once-over to make sure the connections all look good and there are no issues with the cable. If the cable is old or damaged, you might find that your audio lags or drops sound. So save yourself some time crawling around behind your entertainment center and check those cables from the start.
The Google Fiber remote control is not programmable to control external audio equipment. It supports only controlling the volume on your TV when you program it to do so.
If you want the convenience of using one remote to control all of your devices (TV, Google Fiber TV Box, and audio equipment), you might consider purchasing a universal remote control, such as the Logitech Harmony remote.