Come to think of it, when the weather changed from the cold outside to the warm inside, the board would be out of tune terribly until the unit actually warmed up. I had this problem last winter, but never in the summer.
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Live: Korg PA4X/Bose L1 Pro 8/Senn 935
Studio: Korg PA4X/Kawai MP7SE/Tascam DP24SD/Sony C80/AGK 214/ATEM Mini Pro switcher/