I know solo means one, but I thought it was pretty common to expect pressing two solo buttons to both enable the other.
However, I have a solution for you. If you hold down shift and click the solo button, it does as you want. I didn’t even know this until I tried it just now. My recommendation is, before you assume it can’t do something, run Podium and muck around with the features that you want to try, and try shift, or alt, or control keys, and any combination of them, just to be sure that the function isn’t already there. đ