The horn stops were pretty easy once I followed some valuable advice I got here on the forum. Basically, imagine these four measures, with each line representing a measure...

Measure 1) C
Measure 2) C..,C.. ,C..
Measure 3) C..,C.. ,C..
Measure 4) C...

Measure 1 is set to 65 BPM so you hear the whole band playing through the whole measure. The BPM on measures 2 and 3, however, are set to 130 BPM so, in time, you hear these measures twice as fast as the one before. The horn stops play on what BiaB thinks is beats 1, 2 and 4 but, to your ear, the quarter notes become eighth notes for those two measure so you get a really cool sound set of eighth note horn stop. Measure 4 is, once again set to 65 BPM and the whole "band" holds the chord for the entire four beats.

Nothing more than some really cool math at work.

Hope this helps!

Yours in the muse,
Rutherford