The acid line in the "Deep House Mix" is sampled from Armando - World Unknown (My Mix Is Dunn).

It is an example of how Shep Pettibone's genius could make any song, no matter how uncool to start, into a masterpiece. It's actually hard for me to imagine how it was even possible to do remixes in those days. In a time without digital audio in computers, a tempo change was a huge undertaking. Usually having to change the speed of tape and then pitch shift or sample individual lines of vocals. You gotta love his snare fills. God bless Shep Pettibone.

Part 2 sounds like a lost track from Dave Clarke's RED series. It has a massive, beating kick drum, backwards edits and analog synth sequences and stabs. Clarke's records are sighted as an influence by most of the harder techno producers who came after him. Since this pre-dated the REDs by several years, it really shows how ahead of their time these guys were. Unbelievable.

I can only assume they did this production in a big studio on an SSL mixing board, like they recommend in "The Manual", and it pays off in how tight it sounds.