Now that Justin got his realtime equalizer ready I thought I'd check it out. After trying it on a few songs I was not satisfied with its frequency shaping properties. It just didn't seem to work properly. I decided to test it on pure white noise. As you know, white noise should have a flat frequency spectrum so it is a pretty good test signal for frequency shaping filters. Anyway after analyzing the output of Winamp 2.24 with the equalizer enabled it was no wonder why the output didn't sound what is should have. I'll let the pictures speak for themselves. I'm not saying that the equalizer in Apollo is perfect, it certainly has its flaws too, but it does the job with the frequency spectrum pretty well...

If you don't believe what you see but rather what you hear try this: set the equalizer to -20dB at all frequencies except at 800Hz-8kHz to 0dB and play a song in WAV format. If the equalizer works well, the song should sound like it was played through a telephone. Try to pick a song where you really can hear the difference, i.e. a song which has a wide frequency spectrum.