It's a (now outdated) music sequencer, found here

if this happens, i wonder what the maximum file size limit of this

Oh my gosh, I remember this software! It'd be interesting to use it again after so long. I wasn't aware that it was discontinued.

anything more y'all can tell us about this software? what are its capabilities? can it run on multiple OSes? what do people like about it?

Seeing the logo brought me back; I remember seeing and hearing about it a lot online ~10 years ago. Was it ever very popular?

Edit: seeing screenshots I think I actually even had this on my PC I seem to think it was pretty fun

It has versions for Android, iOS, Windows, and MacOS. All but iOS are still not able to be purchased.
Finding reviews for it is not that easy, but a Google search for "Caustic 3 review" might work.
There's also a Discord server: https://discord.gg/FUjtmMK

I used to use it for quick music things (that are probably way better than my Soundation stuff), I should try digging those old projects up.

Edit: I made a complete archive of the software available here.

(Current version: 1.0.1)