A Composition is built with Parts.
You can create a new Part with the pencil tool. Then you have the choice for a Audio Part or a Sequence Part.
When creating an Audio Part, you can browse for the audio file to be played. Then you can double-click or right-click the new part (or press the TAB key) to go to the Audio Lab to trim the start point within that file.
The output of an Audio Part is streamed into a Rack. In the Rack you can adjust the volume, panning or add effects (e.g. reverb) to the audio. By default, when you create a new Audio Part, that part is routed to the already focussed Rack. But more about Racks lateron.
A Sequence Part can be edited in the Sequence Editor by double-clicking or right-clicking the Sequence Part, or by pressing the TAB key.
You can move parts by dragging them around. For copying parts, hold Control (Osx: Command) while dragging.
When you copy a part, then the copied part is referencing the same sequence as the original part, so changing that sequence will have effect in both parts!
If you want to copy a part creating a new, independent copy of the sequence, then use Shift+Control while dragging.
The composer draws the parts with a subtle 3D effect: when a part is drawn 'down', then it's the only part using that sequence. When the part is drawn 'up', then there are more parts using that sequence, and thus changing that sequence affects all these parts!
Tip: If you have 2 parts playing the same sequence, you can "Duplicate Sequence" (in the parts' context menu) to make a fresh copy of the sequence that can be edited without affecting the original sequence. You'll see that the part is drawn otherwise and that the sequence name has got an updated index at the end.
When you move the mouse over a part, and you have the arrow or pencil tool selected, the mouse tool has this dynamic behaviour:
- At the beginning of the part, you get the pencil tool to change the start position
- In the middle of the part, you get the arrow tool to move or copy the part
- At the end of the part, you get the pencil tool to change the end of the part
The Pencil tool has a wide range of functionality:
- New selection: hold shift, doubleclick and drag
- Selection None: hold shift and doubleclick
- Extend selection: hold shift, click and drag
- Draw new part: click+drag in background
- Change start or length: click+drag when pencil hovers start/end
- Move: click with arrow in middle of part and drag around
- Copy: same as move but hold control
- Copy+duplicate: same as copy but also hold shift
- When you hold Alt while dragging parts around, the original timing of the part is preserved (ie pure vertical operation)
- Delete part: hold alt while pencil hovers start/end
A Sequence Part needs a Target (read: instrument) to make sound.
Simply clicking on a Part will display its Target in the Part Property Panel at the top right in the interface. You can change the Target for the selected part in that Part Property Panel.
If more than 1 part is selected, the Target of all selected parts can be changed together.
Note that a Sequence Part can also target non-synth plugins, e.g. you can send automation events to the filter cutoff of a filter plugin 
Detail Info:
- You can use the TAB key to switch between Composer and the relevant editor for the selected part
- Pressing S toggles the Auto Scroll function
- Alt-doubleclick on a part opens the parts' Target editor
- You can widen the tracks column by dragging the splitter to the right. This gives you space for track names
- You can lasso multiple track mutes for (un)muting multiple tracks in 1 go
- You can Solo/Unsolo a track via the track header's context menu (via a right-click (OSX: control-click) on a track header)
- You can also Solo/Unsolo a track by Alt+click on the mute icon
- That track popup menu also contains the functions "Add New Track" and "Delete Unused Tracks"
- Pressing T or clicking the middle mouse button let you quickly change the mouse tool
- You can use the mouse wheel to scroll / zoom (hold Control (Osx: Command)) horizontally.
- A lot of operations can be done on multiple parts at once. Just select the parts you want to include in the operation.
- Control-A selects all notes.
- Control-X/C/V = Cut/Copy/Paste.
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