Not sure if it's a bug or expected behavior (and not sure if I should post it here or . When I want to make a sound-effect of 3 different bars (for a "bloop, pause, bloop, pause, bloop" sound) I am getting a constant sound.

Also, when sound is zeroed out on the yellow bar, it still produces a sound (similar to noise instrument) because the volume is not zerod out. I think the behavior should be if you zero out yellow bar, the volume/blue bar should be zeroed out OR there should be no sound produced on those yellow bars (see below):

The top part only controls the pitch of the sound. If the yellow bar are set to the minimum value, it will play sound at lowest frequency (which can be adjusted with the double slider at the bottom right of the UI).
To control the volume, you need to use the dark blue bars in the bottom. 
What you are trying to do should look like this:

That works but is is a bit of hassle to use - I should have put it in as a feature request instead of bug, as it works as expected.

I would love an option for the yellow/pitch bar to have a minimum value of 0 that produces no sound, instead of the current minimum value that produces a sound. Basically, coming from pico8 sound editor and trying to recreate some sounds from my old projects takes forever - instead of few clicks, I need to set the pitch bar by bar (because bleeper autofills the bars in between) then adjust the volume to make the quiet pauses.

In a perfect world, I would love a mode for Beeper to behave like pico sound editor - only create a bar where you click (the in between bars stay quiet), default volume is 0 and changes only on the bars you click (currently the below example in Beeper would be filled with bars of sound in between):

...but this is not a high priority thing, worse comes to worst I can make and export from pico8.