Connect Pro MIDI Tracks-Audio Tracks Sync issue

Again a question that regards having outboard MIDI gear.

I know that there is a solo defeat option in Cubase. However, I need something that would work like a mute defeat; meaning that I need a track that will never mute even when I solo another track.

Reason: All of my MIDI synths’ audio goes into a mixer that I have defined as an external instrument in Cubase. So when I solo a MIDI track it, of course, mutes all the other tracks which includes my external instrument track. At that point, since all of my synths’ audio outputs are going into the external instrument, I can’t hear the track I have soloed. At that point, I have to also solo my external instrument track which can only be done in Cubase Mix Console. Is there a solution to this problem?

Thanks again, musicullum!