As for sound, if I am using headphones in iRacing it doesn't record any sound. The only way to do this is to go to the Speakers icon on the taskbar and change the default setting to
"Speakers ( Logitech Pro X Wireless Gaming Headset)
Actually, the quality is better since I used previous versions but its a real pain to get working from my streamdeck and with the 1440p message and sound problems I don't think I will be buying this
I have a stream deck with alt + F9 as the rec key mapped in and if I am in the race sim "iRacing" I can just press a button on it and it will record using Geforce Experience