Sorry for the long wait for a reply. But to answer your question, YES. The ASTC and STB both start from a "Blank" zone, but if I try switching either way after playback has started, "It don't Work" lol. the STB --> ASTC gives me analog static and ASTC --> STB gives and "unspecified error" message and kicks me back to the closest (In the channel list) ASTC Station. Not necessarily back to the original station.
I've tried playing around with MadVR and Different filters and other settings in the Video Options, but I don't recall version 17.0.129 having MadVR, Which is the last working version with regards to the dual tuner I have. After 17.0.14?, it gave me the tuner problems. I've Just been using 17.0.12, as that seems stable enough, but I don't want to get "left behind" in the MC evolution.
BTW, my STB is hooked up to my svideo input on the analog tuner.