Soft/una corda pedal question

Yep, it is modelled in Pianoteq, I'm pretty sure.

I found it very hard to tell if there WAS a graduation in timbre and volume!

I'm using a set of Roland RPU3 pedals and all 3 pedals are continuous (potentiometers). Pressing the soft pedal does display a continuous range from 0 to 127 in the MIDI window. The graphic soft pedal position in the main PTQ window also moves through four distinct levels (as does the sustain pedal) but it is very difficult to discern if the actual effect is varying continuously (from tri-corda through duo-corda to una-corda). The effect of the sustain pedal can also be viewed by toggling the velocity button until the velocity curve displays "Pedal" and this shows up as a fading band moving smoothly back and forwards across the graph as the sustain pedal is pressed and released slowly. Unfortunately there is no such display for the soft pedal.

I would also like to know if the unacorda effect is continuous or simply switched in PTQ. Some editions of Beethoven's Moonlight Sonata are annotated for all three levels of soft pedal, would be great to accurately reproduce that.

Just thinking... what's the point of making una corda adjustable? You can't do that on a real piano, so I'm wondering, is there a universal value for this parameter that reflects reality? If not, please consider making it like other sliders in Pianoteq where 1 = normal. I definitely do NOT want una corda unrealistically exaggerated, but I also don't want it unrealistically weak.

^Yes, una corda is continuous (though it's debatable just how continuous it really is), and that dynamic holds no matter what value of una corda intensity you select. Also, hammer hardness is a separate adjustable parameter. The una corda adjustment should have 1 = normal across all hammer hardness values.

Mathematically, this should be pretty easy to figure out and implement. You're simply hitting 2 strings instead of 3, or 1 instead of 2. Unless the developers are taking some sort of short cut (like an EQ and volume adjustment). But I doubt that's the case. There should be a "neutral" or "normal" setting, so at least we know what's most realistic.

So your una corda models soft part of hammers vs hardened grooves, not 2 vs 3 strings? Or does it model both effects?

What value on the slider represents the most realistic una corda effect? Or is this adjustment a way of specifying the age and use of a piano, in that older worn pianos will have a bigger distinction between standard and una corda (I'm assuming, based on how you're saying it works)?

I've been playing Debussy's prelude "Submerged Cathedral" on a C3 using the unacorda pedal to give a muffled misty effect but the top octave seems as bright as ever. The top octave of all instruments seems unaffected by the unacorda pedal even with the soft pedal setting at maximum its this correct?