Are there any sources of code examples or tutorials for Nyquist? I have a basic understanding, but I have trouble implementing some of the more advanced concepts/functions. I’ve looked at the Nyquist Reference manual, but sometimes it’s not always clear. I try to write my own code but sometimes I just can’t figure out why it’s not working or functioning the way I think it should.
There is a very useful “plug-ins reference” here: http://wiki.audacityteam.org/wiki/Nyquist_Plug-ins_Reference
For LISP functions, there is a separate manual that has examples for almost every function: http://www.audacity-forum.de/download/edgar/nyquist/nyquist-doc/xlisp/xlisp-index.htm and it is definitely worth bookmarking the “language reference” page: http://www.audacity-forum.de/download/edgar/nyquist/nyquist-doc/xlisp/xlisp-ref/xlisp-ref-index.htm
There are some code examples and mini-tutorials on my web site http://audionyq.com/ and a few examples on the Audacity wiki here: http://wiki.audacityteam.org/wiki/Nyquist_Audio_Programming
Also, please feel free to ask questions here on the forum 
I guess one thing I’ve tried to play with is the physical models (Section 7.2.2.5 in the Nyquist Manual). How do I actually use the various instrument functions (clarinet, sax, flute, etc)? I’ve tried playing with the various parameters, but I just get a long, awful sounding tone.