Equalizer and tone controls should be disabled or set to their neutral position while you record. If they are not, their settings will changed on the next playback again and accumulate each other. This is probably not what you expect from a high fidelity playback.
Can you get me some information, like sound card, player you use, OS, recording rate etc.?
I can only say that AOMrecord records exactly what the sound card plays
I recommend to use at least 75% or 128 kbit for WMA and 9 var. or 128 kbit with MP3.
It could it be that you don't use the correct input for recording? There was a case where one was recording from a notebook's built in microphone and the quality of course turned out very bad.
It could also be that the signal can be recorded from several virtual sound card inputs. Try another one if possible. One could even get influenced by adjustments in the mixer (bass, treble if available). Have a look at the windows mixer (can be opened from within AOMrecord).
Sorry, but you really have to play around a bit. It definitely cannot be AOMrecord's fault.
BTW, make sure the latest sound card drivers are installed.
I guess that's all I can do from here.