Intro
Hello, I’m @frandev, and, recently (actually, not so recently, but, whatever…), I noticed that the Song Editor (or, maybe just Songs in general, but the engineering behind Songs is NOT at all my craft—take this with a grain of salt) can’t have two or more notes of the same instrument playing at different times, as per demonstrated:

I’d like to know why this is the case. I have my theory, which is likely NOT correct.
My theory
I think the reason it’s like this is that instruments might be handled somewhat like channels on a sound chip. On a sound chip, there cannot be polyphony (that is to say, more than one note playing) in one channel. This is a slightly different concept from the phenomena I’ve observed in the Music Editor, for in the Music Editor, one instrument can play, say, a chord. Just not play multiple notes simultaneously with different timing (not that easy to understand when I put it into words like that, but, basically—all notes that play in simultaneity must begin and end at the same time).
I would like someone with more knowledge on the subject of Music and Songs in MakeCode Arcade to resolve this doubt of mine.
Cheers
@frandev