Flashback and last_prophecy are happening 100%
The flashback that we currently have is an except, and that means that there will be a full version later on.
Last_prophecy is literally named last_prophecy, how can it not appear in like chapter 7?
Seven_four is very possible, but no concrete. If the full version is "Their theme" I'm going to deem Toby Fox the new ruler of Earth.
ROOTS is another likely one, seems like a track for a ch. 6 location where we possibly fight the FRIEND pack.
The rest though? Likely not.
Amphitheater was already a song by Toby, and didn't he say that his old songs related to random stuff won't appear in DR?
Synthesis feels like a missed opportunity for ch. 5, although the name definitely can mean some other synthesis, not photosynthesis.
Waitingroom, as much as I'd sell my soul for it to be an actual soundtrack, most likely won't appear since it's just a segment of TV World with an interesting name.
Same with lacner_waltz, it's just the Acid Tunnel of Love.
yeehaw Erm, acshully, it is just Lancer's motif, but played with walts timing, whic makes it sound like Acid Tunnel Of Love.
Well that doesn't mean it'll appear...
I don't think it'll be as upfront as this. Toby will 100% be way more subtle than that lol