I was thinking of a solution for the high gain/push-pull thing, since I couldn't come up with one, I was wondering if it wouldn't be easier to split gx_head in two: Pre-amp and power amp, just like the rack mount real things( mesa boogie triaxis preamp and stereo2:fifty power amp for example), that way you could combine the high gain 12ax7 code for the preamp with the high gain code of 6V6 for the poweramp and then push-pull the signal, what do you think?. Also I think it would be cool to do that, because it would benefit users with more option variety to the signal chain: who wants to let's say add the tonestack or some effect in-between the preamp and the power amp section, so you don't have only the option of putting it before or after gx_head.
Just a suggestion

Thanks a lot as usual Brummer, guitarix 0.35.1 Rocks even harder!
Att.: Rodney