I'm glad you summoned up the courage to find out definitively what's going on, but I'm a little confused. How does a voice-activated recorder turn up communication via "text, email, or some messenger" ??
Just a word of caution, check the laws in your jurisdiction about recording someone who doesn't have knowledge they're being recorded. In whose name is your husband's car title? Also, NEVER put your own voice on there. You'd be surprised how many betrayed spouses put their own voice on the recorder at the beginning, with the ol' "testing, 1-2-3, testing . . . " thing. Instead, use "tongue clicks" or "finger snaps" or some other noise if you want to verify that the VAR is recording. That way, if he finds it, you can claim you have no idea how it got there.