Thanks all for the ongoing discussion,
Its helped me know, the Mackie, MCU Pro seems to integrate well with Sonar (and Presonus doesn't), and is well known by Sonar users, as I was going post the MCU question separately, now more confident in making investment in it.
and,
What to use on those scratchy old guitar pots and and amp contacts, (contact cleaner Id been using just didn't cut it).
Cheers all, and have a great day.