Another way of explaining the bug: if an effect is enabled when the "mix" (dry/wet) ControlPotmeter > 0, then mix is set to 0, then the effect is disabled while mix is still 0, enabling the effect while mix is still 0 does not work. This is a bug in the effect chain optimization code.
Another way of explaining the bug: if an effect is enabled when the "mix" (dry/wet) ControlPotmeter > 0, then mix is set to 0, then the effect is disabled while mix is still 0, enabling the effect while mix is still 0 does not work. This is a bug in the effect chain optimization code.