Here are the classes, structs, unions and interfaces with brief descriptions:

CAppController	Coordinates presentation of top-level preference and MIDI setup panels
Cbbox_shape
CController	Manages the active Mode and connects UI elements with the PlayArea
CDrawFreehandPadMode	Mode that digitizes a freehand path into a Pad while dragging
CDrawPolygonPadMode	Mode for drawing polygons on the pad with adjustable transparency
CDrawTraceMode	Mode for drawing by tracing over existing elements or guides
Cedge_shape
CElement	Abstract base class for items stored in PadView's element bag
Cgpc_polygon
Cgpc_tristrip
Cgpc_vertex
Cgpc_vertex_list
Cit_shape
Clmt_shape
CMode	Base class for interaction modes used by PlayArea and Controller
CMovePadMode	Mode that lets the user move selected pads and sweep a marquee to select pads
CMutLockArray	Similar to NSMutableArray, but thread-safe. Internally, uses an NSMutableArray and a rwlock
CMutLockDict	MutLockDict is a thread-safe version of NSMutableDictionary
CMutNRLockArray	Subclass of MutLockArray; this class does NOT retain the objects in its array!
CMutNRLockDict	Subclass of MutLockDict; this class does NOT retain the objects in its array!
CMuvicadoTests
CNamedMutLockArray
CNotePaletteArea	Renders a grid of pads mapped to MIDI notes and forwards interactions
CNSBezierPath(GPC)
CObjectHolder
Cp_shape
CPad	A drawable element backed by NSBezierPath with color, text, and MIDI attributes
CPadView	NSView subclass that displays and edits Pad elements
CPadView(Persist)
CPageSelectArea	A PadView subclass providing UI to select and navigate pages
CPlayArea	NSView subclass that hosts pads, modes, and editing commands
CPreferenceController	Manages the Preferences window, including color and startup options
CRestMode	Passive mode that immediately switches to its next mode on mouse up
Csbt_t_shape
Cst_shape
CUtility	Namespace-style class for color math, randomization, and note helpers
Cv_shape
CVVCrashReporter	Simple class which automatically uploads crash logs and other relevant diagnostic information automatically made available by os x to a remote server
C<VVCrashReporterDelegate>	The crash reporter's delegate must adhere to this protocol
CVVCrashReporterDescriptionField
CVVCrashReporterEmailField
CVVCURLDL
C<VVCURLDLDelegate>
C<VVMIDIDelegateProtocol>
CVVMIDIManager
CVVMIDIMessage
CVVMIDINode
CVVSprite
CVVSpriteControl
CVVSpriteControlCell
CVVSpriteGLView
CVVSpriteManager
CVVSpriteView
CVVStopwatch	This class is used to measure how long it takes to do things; much easier to work with than NSDate
CVVThreadLoop	Simple class for spawning a thread which executes at a specified interval- simpler and easier to work with than NSThread/NSTimer in multi-threaded programming environments