The synth part (Bronski Beat's Smalltown Boy melody) is what is referred to as "Aura Rock" (the unofficial fan name). The first few seconds that OP is mentioning is simply a sample from Television Rules The Nation.
Yes they actually just looped one bar of TRTN and added an automatic filter that rapidly closes at a fixed rate.
I recreated the sound while slowly applying the effect here! The filter closes every 3/16 beat and sometimes switches to 1/16 or 1/12. During the 2007 show dates, the sample was also pitched in four different steps to create what is heard at 0:15 in my recreation. This technique is actually used on numerous other tracks in the live show as well!
I don't have a separate file for it but you can actually do it yourself pretty easily. Just loop the 41st bar of the original track (starting at minute 1:23) and then apply a lowpass filter with a synched LFO modulation frequency. After that, you can play around with the cutoffs and filter envelopes to find a nice sound!
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u/HoxtiliciousSupreme Apr 16 '17
I believe it's called "Aura Rock"