Hi, just want to ask your opinion regarding the audya 4. At present I have the x4 module which I had from new and have had for the last 12 years. I really like the x4 but I'm considering buying the audya 4. I run the x4 with midi guitar. So what are your thoughts for me to upgrade ? In what way is the audya 4 going to be better for me than what I've got?