The difference between the V1 and V2 versions is the basic PIANI-3 wiring.
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Version V1 has the reference PIANI-CAB-3-S wiring : a single Binder support (2 Binder chassis 3F) and a XLR3F cable directly welded to a PCB.
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Version V2 has the reference PIANI-CAB-3-D wiring : two Binder supports (3 Binder chassis 3F)