#4 On startup, there should be an initial delay

[Maettu]

After switching on the audio mux, there's the fish logo. Then, it immediately switches on the last selected input channel.
I'd prefer to have a short moment to switch to a different input channel, i.e.:
1. Show fish
2. Show last input channel without immediately switching it on
3. Do a short delay, giving the user the opportunity to switch to a different channel
4. Switch on the selected channel

Rationale:
If "Radio" or another immediately active channel was the last input, that channel immediately creates unwanted "noise" after the fish logo.
By implementing the requested initial delay, no unwanted "noise" needs to be listened to.