Hi there,
You need a manual!
Your questions need a lot of detailed answering.  I have saved an FAQ on my PC from the Roland site which partially answers some of your questions.  I have cut and pasted a bit - I hope this helps.
All the best,
Martin
(P.S. sorry, but you do need a manual).
Selecting Performances
A Performance is a collection of up to 15 Patches and a Rhythm Set that can be assigned in different ways on the XP-60/80. Use the following procedure to select one of the 96 Performances in the XP-60/80: 
1.	Press PERFORM. 
2.	Hold SHIFT and press 0,1 or 2 for the desired Performance bank. 
3.	Use the VALUE dial to select the desired Performance. 
4.	Play the keyboard to hear the selected Performance. 
Note: an Ideal Performance to use as a template for sequencing is PR-A: 12 POP SET 1. 
II. How Do I Split the Keyboard?
Splitting the keyboard allows you to play 2 or more sounds simultaneously on separate sections of the keyboard. For the purposes of this example, we will use Performance "USER:16 Bass / Lead." 
1.	Press PERFORM. 
2.	Use the VALUE dial to select "USER:16 Bass / Lead." 
3.	Press LOCAL/TX/RX, then press F1. 
4.	CURSOR to KEY MODE and use the VALUE dial to select "LAYER." 
5.	CURSOR to LOCAL SW and press the TRACK/PART buttons 1 and 2 so they are lit. 
6.	Press PERFORM, then press F2 [K. Range] (see Fig. 2). 
7.	Use the VALUE dial to select "C-1:C4" for the Part 1 Key Range and "C#4:G9" for the Part 2 Key Range. 
 Fig. 2Performance Key Range Box
	 
There will now be a Bass Patch for the lower keyboard range and a solo Synth Patch for the upper keyboard range. Use the following procedure to select different sounds: 
1.	Press F3 [Part], then press the TRACK/PART 1 button. 
2.	Use the CURSOR buttons and the VALUE dial to select the desired Patch Group and Patch Number for the upper part of the keyboard. 
3.	Press the TRACK/PART 2 button and repeat step 2 to select the desired Patch for the lower part. 
[This message has been edited by MJB (edited 11-26-2000).]