zachgrayio/binaural-beats ? reverse-engineered prompt

Build me a binaural beats generator that can make stereo WAV files from simple presets like delta, theta, alpha, beta, and gamma.

I want a small command line app where I can pick a pattern, set the base pitch, binaural frequency, and duration, then generate the audio file. It would be great if it also supports building longer tracks by chaining together multiple sections with smooth fades and crossfades, so I can make things like an alpha track followed by a beta track.

Please also include a simple build script style way to define these audio targets so I can describe them declaratively and run them with Bazel. If there are any current docs or examples that would help, look them up online and follow the usual setup for this kind of project.

Keep it easy to use from the root of the repo, and make sure the default examples actually work end to end.