Other Useful Tools
Because most applications will deal with recorded audio files, and you will need to perform format conversions and downsampling, an audio editor or converter is helpful.
Many of these tools are available, including at least two quality shareware packages. Voxtudio is a professional telephony audio package available as shareware. It can be downloaded from http://www.xentec.be. Goldwave is a another good shareware package available from http://www.goldwave.com/release.html.