You have not overlooked anything on the Boomerang. We’re just conceiving of these two devices in different ways and the companies use completely different terminology for the same thing, which makes the verbal comparison a bit confusing.
So, you’re right, i am “comparing Boomerang’s 3 (or 4) Tracks to Aero’s Parts.” BUT, what Aeros calls “Parts” (and you have called “tracks” on the Boomerang), the Boomerang in its manual calls “Loops”, which on both devices are actually the SAME. I think it makes it easier to think of the Aeros’ “Parts” and the Boomerang’s “Loops” as both describing the same thing - “SECTIONS” of a song - verse, chorus, intro, middle, outro, etc.
To further muddle the mud, where Aeros provides 6 mixable/changeable Tracks to fill out each song Part, the Boomerang only provides Overdubs on their Loops (Parts on Aeros) which they call stackable “Parts!” Boomerang does NOT use the term “Track” at all. Confusing, but actually not when you understand what each term means in terms of what it does.
Aeros enables building a richer sonic landscape by allowing layering of 6 mixable/changeable “Tracks” for each song Part (section). Boomerang only allows unmixable, stackable Overdubs on each Loop (section).
For my style of playing on Aeros I typically lay down all the Tracks for one song Part (section), then go to the next Part (section), and on and on. As I’d cycle through song Loops (sections) on the Boomerang (which I haven’t used for a while), having a button dedicated to each song Loop (section) made it easier to go between different Loops (sections) in any order I chose, whereas with Aeros all that up and down tap dancing is required.
At this point with the Aeros I don’t play around much with bringing different Tracks in and out on each Part (which I realize others might do), thus once once my tracks are set on each Part I don’t have to cycle through them. But I do change Parts multiple times during a song so for me the ability to change Parts without too much tap dancing is much more important than the ability to cycle through Tracks during a song.
I understand this tap dancing is a trade-off for Aeros’ size and greater functionality, but I think there have to be ways (one already suggested) to make the essential action of changing Parts easier to do. Boy, you really made me think about those two devices! Now my brain hurts!