If you start from an empty data.pic file there should be no sound.
Then you can tweak the first channel.
Then select the other 3 channel.
Every trig you set come with a "green" box and it doesn't come with a "note" which is... I think... weird from an GUI user point of view.
I don't think there is bug on this side, but it's really weird I agree.
I will fix this, because today, it give absolutely no benefit.
I'm sorry you had a poor user experience at this level of development but it's still a young code.
So there is a lot to do to make it consistent on the GUI and in the kind of sound it can produce.