In continuation to this question:
Here's what I learned:
subchunk1Size = 'B\x00\x00\x00' or 11
audioFormat = '\xff\xff'
numChannels = '\x01\x00' or mono
sampleRate = '\x80\xbb\x00\x00' (here I did not understand)
byteRate [28..31 bytes]= '\xaa-\x00\x00' (here, too)
blockAlign = '\x00\x00' (here, too)
bitsPerSample = '\x00\x...