Thanks, Tim. I tried your suggestion, but unfortunately, didn't work.
My iPad microphone WORKS with the Recorder application, but NOT with SKYPE, nor with Talking Tom the Cat (as far as I know, I haven't tried the others). Note that it briefly worked with Skype when newly downloaded, then stopped working in the next log in. I deleted Skype and downloaded the latest version, same results: microphone worked with the test call, then later stopped working.
Please help.