I love my Midjay Plus (have 4 working and one for parts). Its been suggested that I need to move on to the Audya 4. Has anyone experienced converting from the Midjay/Midjay Plus to an Audya, particularly the Audya 4? How difficult is it to learn the new OS? I think the Audya specs say that it has a built-in EQ (other than the vocal EQ). If so, can it be used to replace my mixer? Can EQ be easily adjusted on the fly? I have A LOT of midi files, how easy do they convert? Is it a matter of just tweaking. or are the engine so different that it is a major undertaking?