On the ongoing discussion of expanding the list the following suggestion is offered and I don't know if it helps or hinders. I belong to a small award winning mug and we have our sig's set up as a GS sig, a Classic sig and an OS X sog. The Classic is for computing up to OS 9 and in our case any computer. Perhaps limiting this list in the same manner would assist in the same way. Food for thought. I will be posting my Duo equipment for trade as soon as I have completed a list of items that I would like to have in exchange. Should be within a few days.