Pattern Templates are best described as printable tables designed specially for recording your "Patterns" from the TB-303 / TB-03.
Acid Tabs can also be used with 303 "clones" such as the Behringer TD-3, for example.
However, this being said, the Behringer TD-3 does allow users to back up each individual pattern sequence via USB.
There are 2 blank Pattern Templates to choose from. Both of which will be explained in great detail below.