The Freya doesn’t have what I would call a true version and you have to turn the volume control all the way up on the Freya to get the full signal in bypass.
I get a nasty hum once it’s turned all the way up and it’s driving me mad!
I assume that you were using the Freya+ in tube mode which is +12db with the volume knob all the way up. In my experience, the Freya+ was amazingly quiet at unity gain in all modes.