Hi Karjacha,
Having done what you have already, you should be sorted. Each time you press the AF/TA button your unit will cycle round combinations of both on, both off, and one on and one off (if you see what I mean!). If you don't want to hear traffic reports, then as long as TA (Traffic Announcement) is not lit up then that's all you need to worry about. Personally I would make sure you keep AF (Alternative Frequency) switched to on as this is what allows your radio to keep you tuned to the best frequency for the station you're listening to as you travel about.
The TP that lights up stands for Traffic Programme and all this is, is to tell you when the station you're tuned to is capable of accessing traffic information reports - so this is something that is broadcast and you can't switch on or off .... the station either offers the service or it doesn't and when you turn on TA this tells your unit whether you want to hear it or not. I hope that answers your question, as basically you don't need to worry about TP as long as TA is off.
