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When I returned to the PikTV application after listening to radio with the "myTuner" application from the Google Play store, I found that both the PikTV and radio audio were playing on some TV channels. Strangely not all channels. This is a reproducible affect for this radio application. Note that I tried the same with the "TuneIn" radio app and did not have the same result. The only way to stop this was to go back to the "myTuner" application and "pause" the playback.