Fireworks is a web prototyping app, and now includes an interface standardized with other Suite apps, and the ability to export design comps to PDF documents. The software has also been made compatible with AIR, HTML, Flash and Flex Builder. Soundbooth is the company's audio production software, and has been improved with support for editing multiple clips on multiple tracks, and volume harmonization between audio files. MP3 compression can be previewed before saving, and speech recognition can be used to generate searchable dialogue transcripts. All three betas are free to download, but will only work for 48 hours unless a user has a CS3 serial number. Mac OS X 10.4.11 or later is required, along with an Intel processor in the case of Soundbooth.