How can I change? It's always grayed out (disabled). I remeber I was able to change it to "Normal" instead of "Mute" last time.

Thanks.

It only changes if you set AV Source to Off.

You mean the AV1 and AV2 should be off? Let me try that later . Thanks much!

No, you should select 'Off" in AV Sources menu, so there is no sound at all. Then the button is enabled.

Ah ok. Thanks so much again

somewhat related. there isn't a way to increase the attenuate volume? it seems so low compared to the voice when an instruction is given.