Use external 2 channel mixer w/ S4. Signal chain trickery

Connect TT's to S4 and ground. Leave S4 switch on Phono

Connect RCA Master Out to Channel 1 Line/CD Input

Connect Headphone Out w/ 1/8" to RCA cable to Channel 2 Line/CD Input

Use Cue Mix/Volume and Master Volume w/ appropriate channel volume

Cut the shit out of you traditional battle decks and favorite 10" mixer!

Or pick up an Audio 4 for $50

Nice one Abide! Way to wring more functionality out of your equipment.