Hi, I could use some help figuring out audio. I have a KX155 as a nav/com and a narco integrated nav both of which work good. I have not hooked up the nav audio from either of the units but would like to. I don’t have an audio panel and have no room or need for one. I understand I can just wire them into the headphones audio but Need to wire resistors in-line with each of the nav audio outputs. I’d like to control them with simply the ident functions on each of the radios. I’m using a portable intercom but have a sigtronics SPA-400 I could install if it makes any difference. Thanks in advance