I'm not 100% sure what you mean by annotation track - assuming the commentary audio (narration(?)) - live from an incoming mic(?)
VoiceMeeter will let you do it all at once live - commentary, recording to sonar, audio/synth playback (from live or pre-recorded MIDI). No need to take a second pass to line things up. I use Banana but think you could also use base Voicemeeter. This is because you can pass all the audio elements to the 'B' channel/device. You don't need the recording from Voicemeeter for the purposes of what you are after. (However, if you wanted you could probably record it to either VM or Sonar at the same time regardless). They are donationware so fully featured at no cost - trusting that you'll see the benefits and donate.
I believe HyperCam2 is no different than the others - you won't get the processed/wet audio from Sonar on ASIO drivers(?)
I'd have thought annotation was more about putting text captions, speech bubbles etc on it. I imagine you can do that with the Youtube tools(?). Titles, credits etc I suggest are part of Video editting. I use HitFilm 2 Express - it's discontinued, at the Express Edition level, but pops up occassionally for free. I actually got it for 1 cent from
Videoguys. They still have it ... but it's $5

- This was a $149 product.