hi there! me - just willing to buy a pa50 and hopefuly that will happen in the next month or so... and just wanted to say hi back to you!
about your problem, i suppose there is a "protect" option which prevent the actual internal styles (that you downloaded and install) to be removed. i assume you should do the same procedure as when you installed those styles first time. just my oppinion, i am really not aware of the pa's issues!
all the best!
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Yamaha S770, Studio One 3, EMU 0404USB, ESI, ATH, Dell. And others.