Well, a bug, to be precise.  On the first day, the three "generic" lines where people are reacting to the news about incest are at a SUPER low volume compared to the rest of the audio. I'm on the full voicelines setting, so I don't know whether it happens with cues mode too. I think there were a couple other times when it happened, but I don't recall when.

Also, this is a relatively minor thing, but some of the voicelines are inaccurate to the text being said  on that first day. For example, at some point, I think it was Clarissa, says "Hey pervert" but the voiceline says "Hey Ian". It'll be pretty obvious, so I'd say just run through the first day yourself and you'll find it.

Also, a side note: I would totally be fine if the voicelines were inaccurate to the text, if it means that they say "Ian" less often or preferably not at all. I'm the sort of person who always renames the MCs in games I play, so not having the old name in voicelines would be great. And if you're feeling extra, extra ambitious, you could even include an option for voicelines with or without Ian's name in them in settings, but I definitely see how that would be a LOT more effort for very little benefit. I'm just throwing the idea out there.