Please don't refer me to the "manual", as I have not found it, or anything else online, helpful. Thanks!!

I am fairly new to all this, and don't know the correct terminology.

Yes, but it's because you don't know the correct terminology that you are having problems. Let's start by learning the term SPLIT. In your MOXF a "Split" is defined by a "Split point" this is a single division of the Keyboard into an "Upper" and "Lower" region... there can be only one Split Point. A Part(s) can be Upper (above the Split point) or Lower (below the Split point) or Both (across all Keys). The SPLIT function is a function of the "Performance Creator" - a quick access feature.

A single playable sound in the MOXF is called a VOICE. when in Voice mode you can call up Voices, one at a time, from the Preset 1- Preset 9 Banks.
When you wish to combine two or more Voices, you can place/assign a Voice to an entity called a "Part". A Part is a set of offset parameters applied to the Voice, and is found in PERFORMANCE mode ... which can contain as many as four Voices, one in each of the four Parts.

When you are in VOICE mode you can quickly create a SPLIT or a LAYER, by simply selecting the Voice you want to start with and then press the button labeled [LAYER] or [SPLIT] -- if you do you will see the front panel lights start to tell you a story.
It moves you from VOICE mode to PERFORMANCE mode, it places the Voice you started with as Part 1, and it places you in EDIT, it calls up CATEGORY SEARCH so that you can begin to search for your Part 2. This function is called "PERFORMANCE CREATOR"

A good term to know (it's written on the front panel) and when you do decide to learn the terminology you will know what to look for in the manual. This, however, is NOT what you want.... seems you want freely define the regions...

But I would like to split the keyboard into 3 or 4 parts, so that I can assign different sounds to each section of the keyboard. I also need to be able to adjust the octaves INDIVIDUALLY for each section. For example, I might want a section that plays an organ that sounds like middle C, and another section that plays piano at middle C, and another sound, also at middle C.

I'm not sure I follow what you want here, but you'll be able to figure it out yourself. But from what I explained above, if you require more than one split point (sic) there is another method

We have defined a Split as having just one point at which Upper/Lower is defined.
The next term you will need to be introduced to is NOTE LIMIT.

When you desire to divide the keyboard into more than just Upper and Lower regions, you would NOT use the [SPLIT] button. The Split button is for quickly creating a Performance "on-the-fly"

When you desire is to divide the keyboard into more than just Upper or Lower, you can create a PERFORMANCE using the more in depth programming features.

Press [PERFORM]
Press [JOB]
Press [F1] INIT
Press [ENTER]
This creates an initialized Performance with Full Concert Grand assigned to Part 1

You can now drop into [EDIT] and start to build up your Performance.
Press [EDIT]
Press [PART SELECT 1]
Press [F1] VOICE
Press [SF1] VOICE
Now you can use Category Search to find your Part 1 sound

You will see while [PART SELECT 1] is selected the various [F] and [SF] (Function and SubFunction) buttons give you access to the editing parameters.
For example, if [F1] VOICE and [SF3] LIMIT are selected, you will be able to define the High Note Limit and Low Note Limit for that Part.
As you add additional Parts each will be able to have its own High and Low Note Limits... not just Upper/Lower or Both, but each Part can be regioned freely, even overlapping on portions of the Keyboard.

NOTE LIMITs will be ignored if you use the SPLIT button.
Remember SPLIT is only Upper and Lower with a single split point Key.
Note Limits allow you much more flexibility to define regions per Part.

While in Part Edit you can press [F4] TONE and then [SF1] TUNE
Now you can change the Coarse tuning of the selected Part... by semitones (+/-12 semitones is an octave)

And so on, you can add Parts and edit each as you desire... don't be afraid to learn from the Manual terminology, especially correct terminology is going to be essential to learn the MOXF. I've used the correct terminology so that if you do pick up the REFERENCE MANUAL, you can look up the important words and concepts. The REFERENCE MANUAL (named for its purpose) is a PDF document, making it easy to search through. Do not sit and read a Reference Manual like it was a novel (or the Owners Manual) "refer" to it when you wish to fill-in the blanks on a specific area of the instrument. It gives you a parameter-by-parameter explanation of virtually every button, in every mode!

Even if you follow the above, it will help you with getting a deeper understanding of how things work.

I found 1 way to do this, but I think I was actually using the sequencer??? because I went in through the Song button. I'm actually OK with doing it this way, but I don't think it is the "right" way to do it. Is there a better way? It seems I should be able to assign 4 parts through the Master button, but again, can't figure it out.

The difference between Performance mode (4 Parts) and Song Mixing (16 Parts) is in Performance mode you can play all four Parts from the Keyboard simultaneously. Song Mixing mode is Voices assigned to Parts but each Part is initially set to be played one at a time... like when building up a Song in the Sequencer, recording one musical part at a time.

Hope that helps get you started... I did this from memory, please verify by checking in the REFERENCE MANUAL.
There is also a downloadable "Synthesizer Parameter Manual" that can be very helpful when you run into some abbreviations that you can't translate. Again every parameter has a translation.

You can find all the downloadable items for your MOXF by entering the DOWNLOAD area from the MOXF PRODUCT PAGE on the website: USA.yamaha.com

Go to this MOXF PRODUCT page, then click on "Downloads" _ everything for the MOXF will be found.

I never use the split function. I always go with the layer, as it is more flexible. Use layer, then the "limit" function to divide the keyboard into as many sections as voices if you like.

Patrick wrote:

I never use the split function. I always go with the layer, as it is more flexible. Use layer, then the "limit" function to divide the keyboard into as many sections as voices if you like.

Exactly, The Edit-NoteLimit route is more complex but definitely more flexible. The PERFORMANCE CREATOR (where you find the SPLIT function) is for quick, "on-the-fly" creations where you are going to simply have left and right hand sounds. Certainly, if you want more than just UPPER/LOWER using the EDIT function for Layering