Thank you for your reply.
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With a swipe to the left/right for channel up/channel down. Many other apps do it e.g. Receiver (radio app on the Apple TV). This gesture is not used in Channels yet for anything yet.
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I can entirely use Channels (and the Apple TV in general) with my Sony Bravia remote:
- turn it on: green/off button (TV turns on but not Apple TV) and then I press the OK button (Apple TV turns on). Assuming that the TV was previously turned off on the same input channel (in my case HDMI 1)
- turn it off: current streaming must be stopped, but no need to exit current app (e.g. Channels), turn off TV with green button and after a couple of seconds, Apple TV automatically turns itself off.
However, I prefer the Siri Remote overall as not having to click to browse (but just to tap or swipe) is very satisfying to me
Best wishes