Hey guys, I have a 2005 Taylor and was wondering if anyone has tried the expression system with the Fishman Aura Spectrum or the Radial PZ pre. The concern is running a preamp into another preamp but the Fishman functionality seems amazing. I would prefer it to the Radial but it may work better if it has an active or passive input switch. I haven't ruled out pulling the expression system out all together and just putting in a K&K FanTaStick western in it. Any experience with these two preamps?