Del said... "When you say you use the switch to only apply it to the highs, do you mean you have it set to "keep highs?" Because if so, I was under the impression that it meant "leave the highs untouched."
OK, well let me confirm for you. If you want to keep the highs 'untouched' switch to "Keep High", if you want to leave the lows 'untouched' switch to "Keep Low". That's the official explanation from Softube.
BlixYZ
Aren't we talking about 2 totally different devices here? The Softube Saturation Knob is TUBE saturation while the tape emulator adds TAPE saturation.
Magnetic tape and vacuum tubes are both described to add warmth, but only one is used to add grit and bite at it's higher gain (tube) while tape adds a pleasing sonic "smearing" when highly saturated.
Also, John T said... "It doesn't emulate tape saturation, so it would sound 'quite unlike tape'."
My answer... Well not really, the quoted statement about the Softube Saturation Knob at the Presonus website (They also have it for free in their DAW)... "We are very pleased to make available to all Studio One 2 users the new Softube Saturation Knob extension. With sweet 'Tape Saturation' on a single knob, plus the ability to affect all frequencies, or just the low or high end, this plug-in is quickly becoming a classic."