best way to sync SEQ~ to an audiofile?

Just to update:

I am using sync~ now to drive the seq~ object. So if I want to have everything sync to a tempo I can send this tempo value to sync~. However, in order to make the Seq~ play one bar, I need to divide the tempo value by 4 before sending it to sync~ (2 bars divide by 8, etc.)

Instead of keeping the SEQ~ object synced to a soundfile playing (I will work on this later). I am just having it sync to different loops I load and play in the wave~ object.
In order to use sync~ to drive these loops as well,I had to write a patch that would determine how many bars the loop I am loading is so that it could determine the appropriate subdivider of the tempo value for sync~. e.g. if my seq~ loop is one bar then sync output is divided by 4 while the audio loop being played at the same time may be 16 bars so it’s sync value would have to be divided by 64.

I think that what I am trying to do should be simple but I feel like I am over complicating it.

The final goal:

I want a patch that pre-loads a bunch of different loops (of different sizes) into buffers. I may need to manually set (and store in coll) the length of each buffer in bars so that when they are loaded into wave~ they play at the right pitch given the current tempo. So basically I have a loop playback system. Nothing new.

The other half of the patch employs a seq~ object to record loops of midi notes from a single source. I will be constantly clearing, overdubbing or just playing the midi loops and they should always be in sync with the audio loops.

any tips?