Hello Neil

> The manual describes how to get it working for frequency multiplying, to
> function with the a-155 I think

Yes, but this is only the basic description of the principle. This is
well spread knowledge if you read a bit about the module.

I need to know how each of the three phase comparators works, how one
should set the module up (filter cutoff, VCO offset) for each of the
three possible comparators, and which phase comparator is the most
useful for which application.

Florian