From LMMS Wiki
This page serves to coalesce art-oriented documentation on the architecture of LMMS. This section is very new, please help refine these if you spot issues or can help fill out information on a missing topic.
Short, introductory pages on each topic establishing what you need to understand.
A list of all the graphical work that should be done in LMMS.
Roadmap for artists
This is a contents page only - all actual articles are supposed to be linked from here. The rationale behind the structure of this page can be found at the Wikipedia article on Software Documentation.