C24 newbie question 2 talkback mics

[Nathan W.]

I'd like to use an external talkback mic in combination with the on-board talkback mic on the console. Basically, there's an "on off button / switch" on the external talkback mic itself. Now, if I go "main->Cue switch on" I can hear the other external talkback mic through the mains in the control room. So how do you route the external talkback mic to go directly to the cue's without being heard in the Mains? Also, haven't plugged the external talkback into the external talkback input because I want to use the built in talkback on the console.