DeafSCUBA98: You're right. At only a week post activation, it's too early to understand what you are hearing. It took me 3 weeks before I was able to understand some speech and 4 months before I was able to understand most conversation in quiet and in noise.
My audiologist reminded me that even at 4 months post activation I'm still in the process of learning how to hear with my CI.
One thing I can guarantee you is that it gets better with time! You may notice subtle sound changes one day but not the next. When my audi told me that the sound quality of what I heard would get better over time, I found it hard to believe until it actually happened.
Spending a day using each program is a good idea. I know some CI users who switch programs on an hourly basis and then wonder why they don't become used to what they are hearing.
My audiologist started me with ACE at 900 Hz and told me to continue using that program until I needed a new map. She said that putting different speech strategies (i.e. ACE, SPEAK, CIS) on my processor would make it more difficult for me to become used to one program.
At my second mapping my audiologist switched me to ACE at 1200 Hz, but I couldn't make sense of anything I heard. This reminds me -- when you go for a mapping, make sure your audiologist always keeps an older map on your processor. That way, if you're having problems with a new map, you always have an older map to go back to. (I wish someone would have given me this advice before my 2nd mapping when I lost all of my speech discrimination. Now I know better.
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I've been using ACE at 900 Hz since my activation day and so far, it seems to be working really well for me. You'll have to experiment to find out what program/speech strategy works best for you.
Hang in there! It *will* get better!