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Open Sound System for FreeBSD is a audio subsystem that provides a cross platform audio and MIDI API with device drivers for most consumer and professional PCI and USB audio devices.

LPAC is a codec (coder / decoder) for lossless compression of digital audio files. "Lossless" means that any compressed file can be decompressed in a way it will be bit-wise identical with the original. This is the main advantage of LPAC compared to lossy formats like MP3, WMA or RealAudio. On the other hand, lossy codecs can achieve higher compression ratios. For example, MP3 at 128 kbit/s achieves a (fixed) compression ratio of 11, whereas LPAC's compression ratios range from 1.5 to 4, strongly depending on the audio material. Typically they are around 2 for pop music and 2.5 for classical music. This may not seem much, but remember you will get back every single bit, no matter how often you subsequently compress and decompress a file. It is true that general archivers (Zip, LZH, gzip) are lossless, too, but they often achieve nearly no compression on audio files.

Perl Audio Converter (PAC) is a tool for converting multiple audio types from one format to another. It supports the following audio formats: ------------------------------------------------------------ 3G2, 3GP, 8SVX, AAC, AC3, ADTS, AIFF, AL, AMB, AMR, APE, AU, AVR, BONK, CAF, CDR, CVU, DAT, DTS, DVMS, F32, F64, FAP, FLA, FLAC, FSSD, GSRT, HCOM, IMA, IRCAM, LA, MAT, MAUD, MAT4, MAT5, M4A, MP2, MP3, MP4, MPC, MPP, NIST, OFF, OFR, OFS, OPUS, OGA, OGG, PAF, PRC, PVF, RA, RAM, RAW, RF64, SD2, SF, SHN, SMP, SND, SOU, SPX, SRN, TAK, TTA, TXW, VOC, VMS, VQF, W64, WAV, WMA, and WV. It can also extract audio from the following video extensions: -------------------------------------------------------------- RM, RV, ASF, DivX, MPG, MKV, MPEG, AVI, MOV, OGM, OGV, QT, VCD, SVCD, M4V, NSV, NUV, PSP, SMK, VOB, FLV, WEBM and WMV. Parallel processing, a CD ripping function with CDDB support, batch conversion, tag preservation for most supported formats, independent tag reading & writing, service menus for KDE Dolphin/Konqueror are also provided.

This is actually a set of three modules to access the CDDB online database of audio CD track titles and information. It includes a C extension module to fetch track lengths under Linux, FreeBSD, OpenBSD, Solaris, and Win32, which is easily ported to other operating systems.

Patchage is a modular patch bay for audio and MIDI systems based on Jack and Lash audio systems.

This module allows one to read and manipulate so-called ID3 informational tags on MP3 files through an object-oriented Python interface.

Joins up multiple wav file sound clips of letters/numbers being spoken, optionally adding distortion and echo. This could be use to complement an image-based CAPTCHA to enable people who are unable to read the security image hear it read out instead.

play is a command-line based audio player. supported formats: RIFF and U-Law.

playmidi is a small, quick midi file player using the level two sequencer of the voxware 3.0 package to play on general midi devices or FM or Gravis Ultrasound. If no files are specified, playmidi will give a short summary of usage options. If more than one file is specified, you may skip to the next file while the current one is playing by pressing your interrupt (usually control-c) key. If you invoke playmidi while it is al- ready running, it will allow you to control the currently running invoca- tion until its death, after which time all waiting invocations fight to go first.

This allows a M3U file to be loaded into musicpd. This is useful for loading stuff from some audio streaming sites to be loaded into musicpd.