1- You need to take the speaker signal.
2- Add a 100 N Capacitor in serial with this signal
3- Add a RCA Connector after the signal to connect to Empeg AUX IN

It could probably Works.

It works for me but I used the Hand Free Kit with a simple Mic and One Ear Headphone



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Empeg IIa - 10 Gb - Red Fascia - Tuner, the day is coming - I Will Strike From the Grey -