I built a hands free cell phone adapter based on a headset for an android phone, little dash mike, and an answer button, it puts out audio to honkin amp that p

I built a hands free cell phone adapter based on a headset for an android phone, little dash mike, and an answer button, it puts out audio to honkin amp that powers the trucks stock speakers, the amp has a high impidence output and gain control that works with the headphone output just fine (no hum) hitting the button cuts off music and answers the call. Totaly stealth phone shelf where the stereo used to be.