This video shows how to program irregular length patterns on a tb303
The usual pattern length in 16 steps but in this video I show how to program a 4 step pattern, a 2 step pattern , a 5 step pattern and 7 step pattern.
The video also demonstrates that a tb303 never really deletes pattern note data only timing data.

Enjoy

If you want to know how to program a 16 step pattern on a tb303 check out this post I made earlier.