Does the BK9 fit if not in the case? I know most 76 note cases are way oversized for the slender BK9! Only thing I found that wasn’t stupid big was a now discontinued SKB hard ABS case meant more for 73 Nord’s etc, but the BK9 JUST squeezed into. Bit too snug for flying, but fine for self handling.
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An arranger is just a tool. What matters is what you build with it..!