The functionalities are explained in the tables on pages 9 and 10.

"Part control" does not mean you are controlling "16 parts of a part". You are still controlling 16 parts within ONE, currently selected performance.

I would say that "Performance Control" is more live-oriented (it allows you to select the 8 playable (see "keyboard control") parts using row [A1-8] and mute the 8 playable parts using row [A9-16]. In "Solo" mode you get only access to parts 1-8), while "Part Control" is more studio-oriented (you can select any of the 16 parts, but you need to press the [MUTE] button use the mute functionality)

Here are those tables attached. I might need to stare at them even longer until it sinks in. I do see that with [Part Control] you switch on/off the Arp/MS function but in [Perf. Control] you actually select the types of Arp/MS desired.

It will not sink in until you are in front of the product. And when you are it will become clear. Basically the CS1-8 take on different roles depending on what you are doing. Similar to how the CS on the XF work as Part Volumes 1-8 when you select a Part between 1 and 8, then switch to 9-16 when you select a Part in that region.

The grid of lighted buttons on the right front panel have several roles as well. They can be used as Quick Access to your "Live Sets", and then in a similar fashion to the XF can be retasked as "Performance Control" buttons, Mute buttons, Solo buttons, giving access to Part 1-16 (top two rows); a row of 8 to select one of 8 Motion Sequences; and a row of 8 to select one of 8 Arpeggio Types.

Don't strain yourself trying to read this without actually pressing the buttons and viewing the screens... It's like trying to read an instruction about how to tie a shoe, it makes it sound much harder than it is. It'll make much more sense when you see the screen and the buttons, together.

It really is just different functions on a main screen from when you are in Edit or whether you select Performance Control or individual Part Control.

Thanks BM. I thought I was just losing it although that is probably occurring as well. I don't have any real Motif experience although I have auditioned the voices but that's about it.

It writes like it's complicated but makes sense when you are using it. Here's an example, say you create a Performance that has a Choir, Strings and a B3 Organ in Parts 1, 2, and 3 respectively, when the Performance is first recalled CS 1, 2, and 3 control the three instrument sound's relative volumes to each other. If you select Part 3, by touch its corresponding button, even as you are playing the Choir and Strings, you can now manipulate the "drawbars" of the B3 sound. In this fashion you can retask the Control Sliders to Control what you want when you need it.

Nice!