I'm not seeing any real use for the ext jack on my Tremolux. I just got a new OT for it and it has a 4 ohm tap, so I'm thinking of adapting the ext jack for 4 ohms. I figure I would have to split them completely, that is each would have a connection to the common - which I could jump from one to the other - and each a separate tap, and that's it. No shorting jacks, no switches, etc. In other words, either unused jack would have to be open. Am I right?