Hope your holiday is good as well! Aw hell yeah, looking forward to the lyrics.
In that particular line, there's the main vocals and the backing vocals. There's also a synth line being played that is using my vocals as a sample, so that might be what you're hearing there - has a similar sonic quality, and is playing at pretty much the same time.
Ah-ha. So I guess a little bit of both, in the end. It reminds me of how guitarists would harmonize with a singer's voice juuust right. Real neat to hear that come through over digital media.