Hi NeilBennett,
I would recommend that you just leave it for the moment if the sound is working. That SndTAudio is a third-party driver for sound and could be from another device you might have installed. The IDT driver is one that HP uses and normally when you see it with a AMD driver when you have switchable graphics but it doesn't appear as if yours does. The AMD driver is your main driver as you have an AMD card. If you have any further issues just post on this thread and I will get a notification.
Thank you,
