The manual that came with it is only a basic first time use and set up manual. can't find a volume for messages received ringtone.
Jim, I checked the Archos website and they only have a quick start guide. I'm not sure if that's going to help you, but I've already uploaded it to the Archos 50 Platinum page.
If you need any help with your device, just post another question and we will do our best to help you out. Have a great weekend.