The CFX Concert is a four part Performance however all four parts seem to be required to play the CFX Concert. So if my thought is correct then each of these parts is actually an Element that makes the CFX Concert. So CFX Concerts.requires four performance parts. Am I thinking correctly?
Yes, but there are still Elements. Each Part can have as many as eight Elements. So it would be correct to say that each of the four Parts that make up the "CFX Concert" Performance are used as building blocks to make the complete sound.
An Element is a building block. The first Part of the four concentrates, in great detail on the soft strikes of the piano, the second of the four concentrates on the mezzo forte and forte strikes, and the third on the undampered notes strikes... The fourth is the key off component. The piano uses all these different Elements with their own Filters, a Filter EGs, Amps and Amplitude EGs to detail the piano. You get more possibilities than if we just made an architecture with 16 Elements in one Part entity.. Because you can now treat the Part differently via the available Effects and EQs.
By breaking the mold of the previous architecture (Motif/MOXF) Montage is able to get much more nuance and detail in these sounds. You hear it, you feel it immediately. (Even if not understood...)
But fundamentally your thinking is spot-on correct.
We'll add that, when working with a Performance that is functioning as a single instrument but occupies multiple Parts, you can assign all Parts to a stereo pair of USB audio outputs for recording; you can also assign the Montage to single channel when creating Midi data for editing.
You can use the MIDI I/O mode = Single, this allows you to choose a single MIDI channel on which to capture and playback your performing as MIDI data to an external DAW; once recorded as MIDI data you can edit your playing, then setup to render your playing as audio. (You can keep a backup of the Midi data, muted - for that extra layer of "undo" ).
Keeping the MIDI data in a muted folder on your DAW, will allow to redo your audio rending again later. Often as you build more instruments your concept of EQ'ing chances. The Montage features a 3-band EQ Pre the Insertion Effect blocks, and a 2-band fully parametric EQ Post the Insertion blocks on every Part!
An added advantage of rendering audio is it frees up your hardware for new duties.