St = Stereo
Mn = Mono
MW = Modulation Wheel (programmed in the performance to alter the sound)
+ = keybanks pich-shifted positive (up)
- = keybanks pitch-shifted negative (down)
In the case where not every note is sampled, the original key is tuned (pitch-shifted in half steps) either up or down to reach the next sampled note.
The result is a difference in certain timbre and character aspects.

Hope this helps.

Does that mean, for example, that voices 1-3 (CFX St, CFX St+ and CFX St-) are different sets of samples of the CFX piano in stereo? And that the first set has samples of every note, and the second and third are smaller sample sets?

And likewise for voices 4-6 (CFX Mn, CFX Mn+ and CFX Mn-), but in mono?

If that's correct, why have different sample sets, especially considering how Yamaha raves about the quality of the featured piano(s). Why not create variations of the full sample set via DSP and/or editable parameters? What advantage is there in a smaller sample set?

Is any of this info (explanations of the abbreviations) in the documentation, and if so, where? Just wondering if I missed it.

Thanks, Avery.

Not exactly...They are all the same sample set, just mapped differently.
The mono sets are derived from the stereo sets just not in stereo, and also have different mapping.
The DSP and editable parameters you will find in the performance memories.
Blake has an excellent video on how performances are intended to be used in the resources section.
Let us know if you need anything else. Hope this helps.

Avery

Thanks! I also wondered what the + and - meant.

Could you also tell us what "Comp" means, as in CFX Comp? I assume it might mean Compressed, but if so, would like to know specifics.

Could you also tell us what "Comp" means, as in CFX Comp? I assume it might mean Compressed, but if so, would like to know specifics.

The CFX Comp you refer to is the name of a PERFORMANCE "017(B09) CFX Comp"

This denotes that one of the two Insertion Effects is a compressor. (Classic Compressor)
You can hear the impact of the compressor on this piano sound by pressing the INSERT button turning its LED to OFF. (Bypass). Play a bit, then turn the INSERT back ON - play some more. Compare the response of the sound.

You should notice that the compressor assigned to Insert B makes the sound a bit louder, but more importantly, you will notice that it severely impacts your ability to play soft. The compressor reduces the "dynamic range" (the distance between soft and loud). So that it is very difficult to play softly with the compressor engaged. This is accomplished by reducing signal that travels above a certain level - the result is a thicker, more compact sound, that punches through.

A Compressor is an amplifier that the more you put in (above a threshold level) the less you get out. So loud sounds are reduced, soft sounds are unchanged... Result soft is closer to loud, the dynamic range is compressed.

It is used for that punchy, rhythmic piano style of playing (Jerry Lee Lewis, hard knockin', piano rockin' rhythm and blues)... not just this type, but it would be extremely inappropriate to attempt to play a ballad or that type of thing, if you get my meaning. Compression gives presence, and can be used to put something close, in-your-face...

You will notice that your soft strikes and your hard strikes when playing, result in not that big a dynamic range difference. This is because for every +2dB you go above the threshold the compressor allows only +1dB increase. This Performance has a 2:1 Ratio setting. Mild compression.

Press and hold the INSERT button to take the shortcut to the Insert B Edit screen.

Threshold - the level input at which the compressor will engage to reduce loud signal (gain reduction)
Output - the level after the compressor used to return the overall signal to "unity" gain
Attack - the time it takes for the compressor to engage
Release - the time it takes for the compressor to let go of the gain reduction
Ratio - the degree of compression - when you reach 10:1 ratio - this is considered a Limiter - as it takes +10dB above the threshold to get that same +1dB out