We’ll, very interesting developments!

I totally uninstalled my Presonus audio interface. I reinstalled my original Line 6 Toneport UX1. I opened PT and set the midi and audio preferences.. I chose the ASIO driver for the UX1. Works perfectly! All audio functions through the PC are back. No ASIO errors at all (so far). The only interesting thing that happened is in the audio input screen I checked the box for monitoring the audio input and PT shut down. So I relaunched it, reset the audio prefs but did NOT check the monitor audio input box and no problem.
Interesting in the past I always had to check that box in order to hear my keyboard in audio. Now I can hear it without the box checked! (?!).
Time will tell. I was totally out of patience!
Thanks all for all your help! Beside everything else, I learned a lot!
Bernie