In Workbench, I tried to save the O-18 model (middle acoustic setting) to have open-Eminor tuning for a song I'm working on.  In other words, if the model knob is set to O18 and the tuning knob to "model", I want the tuning to be in Eminor.  However, I can't get it to work.  It's still in standard tuning, even though the screen in Workbench shows the alternate tuning at the bottom.

I have no problem doing this with the non-acoustic models, for example setting the "Special" models to have various Sonic Youth tunings in "Model". 

Anyone else seen this problem?

(Edit: I first typed "custom", not "model".  I meant "model" on the alt tuning knob.)