I think you are misunderstanding how sample chains work. You are talking about sample chains right? Maybe I am misunderstanding you though.
You create a wav file with 16 808 hits evenly spaced one hit per bar. The samples of course are of different lengths but they are spaced evenly. Then you just create a 16 slice grid. You know have 16 single 808 hits sliced and ready to be sequenced.
Hope I didn’t misread you.