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The question is if this adjustment (- 10/+4) intervenes with the signal
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I believe it intervenes to adapt the BFD electronics to the input level.
A PRO level can have a maximum ~+16dBu (about +5volts), where a consumer level will have a maximum of ~+2dBV (about 1.25volts). The switch ensures the electronics is padded accordingly.
brucek