Go to the Timing menu and add a new timing track for your MP3 eg Betas or Bars or both.
then back to the sequencer grid and first Render ALl to make sure that your LOR seq plays (this is a data layer).
Now select either the Beats timing track or the Bars one (you select it by selecting the small circle top let against the name of the Timing track).
Now drop the effect against one model (er Arch) and stretch it to last a few secs.
Now play and only that component (ie few secs of Arch) should change.
If as per your previous post you have DEleted the timing grid , and have none selected , and are dropping an effect - you may not be able to see against what and where it goes.
