Cookbook does not contain any examples of the Dunne `Sampler()`

[maksutovic]

The only use of the sampler in all of the cookbook examples are from AppleSampler() -- considering how excellent the native Sampler() is we should make an example.

I will assign myself to this task as I have a good working example with a .sfz and compressed sample files.

I will just wait for the current issue with the envelope generator prior to getting this out. Thanks!