More detail with Cardas ICs? Now that's hilarious!
As for determining neutrality of an IC, if your system has a tape loop, put the IC there and then flip the switch to "Monitor" for that tape loop and notice the difference between the switch engaged and not.
As for determining neutrality of an IC, if your system has a tape loop, put the IC there and then flip the switch to "Monitor" for that tape loop and notice the difference between the switch engaged and not.