FlatBack, many thanks for letting us know what you found out from Rick

. Really helpful. I expect maybe Bolo will fill us in some more if he finds further info when he visits AI. It is very cool that different bassers can use the HP and notch filters to fit their particular needs and that both filters work nicely. Congrats to AI for some swell design work

. I see now that there really are no contradictions with the way you and UncaToad use your Focus filters.
I'm like you FlatBack, I've only been using the Coda III HP filter for my Rev II piezo pup. It works ....... definitely a difference compared to having the filter turned off. At the volumes I play (relatively low), I'm not finding that the notch / phase reversal feature is necessary but it's good to know that it is available. FlatBack, thanks for jumping into the thread I started, I learned a lot from you.