I am trying to make a program that replicates the THX sound, and I'm getting some surprising behavior from ListPlay - although it could be my understanding that is at fault. Consider the following code snippet:

ListPlay[Table[(0.2 Sin[2*Pi*(220 + (220*(s/8)))*s]) + (0.1 Sin[
      2*Pi*440*s]) + (0.1 Sin[2*Pi*220*s]), {s, 0, 8, 1/44100}], 
 SampleRate -> 44100]

I would expect this to generate three simultaneous sounds: a 220Hz sine wave, a 440Hz sine wave, and a sin wave that starts at 220Hz and slowly rises to 440Hz. Instead the rising tone rises well above 440Hz for reasons I do not understand. Is this an issue with my code/understanding of a rising tone, or an issue with ListPlay? the Spectrogram function can be used to visualize the issue.