QuikDaw
QuikDaw (provisional name) is a general Digital Audio Workstation written in C#.NET, and heavily based on the NAudio libraries by Mark Heath and VST.NET libraries by Marc Jacobi.
The General Midi sounds that are included in QuikDaw are produced by BassMidi VSTi, a free SoundFont player by Falcosoft, consuming the soundfont: Reality_GMGS_falcomod.sf2 (version 1.2) , also provided free from Falcosoft
Incidentally, the performance QuikDaw provides is certainly NOT on the level of commercial DAWs, but it can be reasonably sufficient depending on the project at hand, assuming modern CPU speeds and memory. So far I've used it to edit a few hour-long podcasts, with up to 10 tracks of voice/music, and reasonable numbers of VST effects, without pushing things too far.
For me it would have been impossible to even consider making without the existence of the robust .NET libraries: NAudio and VST.NET, so the utmost kudos go to their respective authors.