No, audio will not go through the ARINC box. That's for ARINC data. Audio from the 430 goes to the audio panel.
BTW, not sure what "alerts" you're referring to...the 430 provides COMM and VOR/ILS Ident, but I'm unaware of any "alerts" (unless perhaps you have TAWS installed as well, or something like that).
2017 Dues paid!