Thank you MOZZER for your firmware, but it's for big AUDYA (76 keys). I loaded it (first renamed AUDYA52A.MEM to AUDY452A.MEM), but assigment of faders (right, lower, bass, drum etc ...) are wrong. So still looking for AUDY452A.MEM file ...
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Nord Stage 2, Ketron SD90, Audya 4+5, SD1000, Roland E-A7, SC8820, Korg microarranger, Alesis Vortex, TC Helicon VL2, Soundcraft Ui12, JBL EON ONE (2), RCF312A