Typically I'd say "EQ" -- But more to the point would be to figure out why there is too much top end in the first place. The source (of course), the mic, the preamp, etc., etc., etc.
What are you using to monitor the recording and what are you listening to the playbacks through. burn a cd of what you recorded and try to listen to it on different platforms and then decide if its too much treble
I've a Xlr mic. But due to money problems i cannot afford an interface. So i have a cable which goes from the xlr mic to the 3.5mm pc soundcard. I live in INdia so it's all costly up here
io2 express... Easy to use, cheap, the perfect start up piece.
I bought it as my first interface and still use it as my everyday interface for monitoring and tracking mono sources. I don't use the preamps anymore though as I bought a stand alone box.
The ONLY issue I have about it is that you can't do 2 mono sources. Either 1 mono, or one stereo.