Question about disabled power amp

So.. is it normal when I have the power amp globally disabled that the Presence knob is still impacting the sound (the one from the PWR page in the amp model)? Kind of confusing. None of the other knobs seem to impact the tone (depth, tube type, neg fdbk)
 
If I remember correct the Presence knob become a highpass filter when the poweramp is disabled (or sag is turned to zero)
 
It's a high cut when the negative feedback is 0, whether or not it should be affecting the sound without pa modeling? Idk
 
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