The modules control the advance. I have no idea how it is done but it is as smooth as silk from idle to full advance.
I've written it before, the poor old 'plat gets a bum wrap.
May have a reputation for module failure but as there are 2 it is only logical you are twice as likely to have one fail. ;)
I'd take a 'plat over a dyna these days. Dyna 3 should be renamed 'dying in 3 days' IMO. Old ones seem to go fine, try fitting a new one. ::)
Rod