1 somtimes i get parts that keep giving sound even when i turn the parts volume of

We think you meant to say "off". Part Volume can be set to a value 0-127, you cannot turn a Part's Volume = Off... you can turn a Part = OFF... In which case it cannot sound. We are going to make another assumption and assume you mean the Part Volume = 0. Yes, it is still possible for a Part to sound with the Part Volume parameter set to 0.

This could be because the Part Volume or the Element/Operator Level has been programmed to some other controller than Main Channel Volume (cc7) - this is what the Fader controls. For example, the Part Volume slider might indicate 0, because the programmer decided to assign control over the output level of this Part to a realtime controller (for example, an Assign Knob, a Wheel, a Switch or other method to move the output level. In the Motion Control Synthesis Engine there are many more ways to assign the output of a particular component.

It can be complex because you sometimes want to commit the entire output level to an alternate controller, but sometimes in a musical situation you want to have one sound that can crescendo, while others remain the same (you're playing piano / strings and you simply want to swell the strings); or you might want to have a pre-set balance between the sounds but need the flexibility to increase and decrease one of them (you want to play both piano and strings, but need to increase the strings and then completely fade them out).

It's fairly easy to understand how these various scenarios could be handled with Faders... but what if you don't have an extra hand or two to make these changes while performing? By assigning control over the output level of a Part to a physical controller it is possible to perform with precision, even the most complex volume changes.

If you think of the Fader volume level setting as a minimum or maximum setting, and you see it still 0... then you can look for "Part Volume", "Element/Operator Level" as Destinations within the Controller matrix...

Say you bias the Part Volume to the MW... You do so by setting the "Part Volume" parameter to 0, press [CONTROL ASSIGN], move the MW.
Because you set the Part Volume to 0, the full range of the Part's Volume will follow the position of the Mod Wheel. And since the MW normally resets to a 0 value... this Part will start silent. You would use this when you want to play the Piano layer and then fade in the strings.

The MW position represents the Part Volume. The MW is a uni-directional controller -- it sends values 0 thru 127. It is minimum to maximum and back. Let's set the String Part Volume equal to the Piano Volume. Now when you move the MW you can increase the relative Volume of Strings so they are louder than the piano (and then back to balanced).

What you cannot do with the simple MW movement is reduce the strings from the stored value (not without special programming to apply a negative curve, etc.). Same as you cannot turn down from 0. A minimum to maximum controller cannot turn down from 0. It's unidirectional by design. There and back.

Say you bias the Part Volume to an Assign Knob... now you have a choice. The Assign Knobs can be configured to be a minimum to maximum control (unidirectional) or it can be set to be bidirectional (this is where you can move above and below, to the left or the right of the starting point). Musically, you can immediately see the advantage here in certain situations. You can use the Main Channel Volume to store a 'start point' for the output of the Part, but you can now move that output level in either direction. The original output value is set by what you need musically and using a parameter called the "Ratio" you can determine how much change above and below the start point you dynamically need.

It is this ability to both choose and scale the amount of change in a parameter that is important here. When you see the Fader Volume setting at 0, you can assume, right away, that the output of this Part has been assigned to an alternate controller. Conversely, if the Fader Volume setting is a significant value, and you are hearing/seeing nothing from that Part, you can assume that it's output is being determined by a controller condition. Perhaps it is set only to sound when a Velocity range is reached, or a Note region is attacked, or an assignable switch activated, etc., etc.,

In our tutorial articles, one of the first skills you want to master is the navigation of the Controller matrix... this is where Controllers (Source) are assigned to Parameters (Destination).

2 when i add a part that is actually a preset with 3 or 4 parts like the imperial grand it only puts 1 of the parts and is unusable

You can combine Performances by adding a Single Part, one at a time or by merging all the Parts of a Multi Part ... it depends on how you set it up.

Say you have the String Performance "Ens Mix" recalled... and you want to add the "Imperial Grand"
Touch the "+" in Part slot 2 to ADD a new Performance.
Because you touched the "+" to add a Part the "Performance Merge" search screen appears.
(You can always know where you are - the top line identifies the screen)
Make the settings across the top... you can set "Bank", and "Attribute", but most importantly you want to set the "Source" = All, if your goal is to "merge" all of the Parts of the selected item.

Thanx, that will help.