Some Great (Free) Tools for Generating and Analyzing Audios
Audacity is a great cross-platform audio editing and recording program that is free and open source. I highly recommend it. It can export in .wave, .mp3, and .oog formats at various sampling rates and quality settings. It has multi track editing, effects, generated tones and spectrum and other analizer tools. Below is an image of the Audacity interface. You can download a version to work on your operating system at http://audacity.sourceforge.net/download/ .
SBagen is one of the best tools I have found for generating binaural beats. It is cross-platform, free, open source. There is a bit of a learning curve but if you read the documentation that comes with the program it is not too tough and it is well worth the effort. There is a user's group where questions can be asked as well as various forums on the internet. On Windows machines once the program is installed double clicking on any of the provided examples plays the example. The examples can be edited in any text editor to easily create your own. Sbagen files can be converted by the program to .wav format which can then be edited in an audio editing program (like Audacity). I don't have experience with the other operating systems but assume they are similar. SBagen can be downloaded at http://uazu.net/sbagen/#download.
Bavsa is another open-source program by Jim Peters, author of Sbagen. It is a tool to analyze binaural beat .wav files and is a great way to get a visual representation of what is going on in a binaural beat audio. First run bavsa.exe to process the .wav files and then run bavsa-view.exe to see the results (read the documentation for details). To the right is an image of the bavsa display showing both binaural and monaural beats, their frequencies, and carrier wave frequencies occurring 3 seconds into the audio.
