Me contesto a mi mismo. Mi duda estaba resuelta en los comentarios:
"You have to use jacks that support turning one signal off when you plug something in. So you take 3 jacks and put the HH on the first one and at the same time connect the HH in from the jack to the jack switch that will brek the connection when you plug something in. That you connect to the SD jack and so on."
Así que supon...
el 09/02/2015
