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PortAudio is a free, cross-platform, open-source, audio I/O library. It lets you write simple audio programs in 'C' or C++ that will compile and run on many platforms including Windows, Macintosh OS X, and Unix (OSS/ALSA). It is intended to promote the exchange of audio software between developers on different platforms. Many applications use PortAudio for Audio I/O. PortAudio provides a very simple API for recording and/or playing sound using a simple callback function or a blocking read/write interface. Example programs are included that play sine waves, process audio input (guitar fuzz), record and playback audio, list available audio devices, etc.

A multi-channel MPEG encoder, using the ISO13818 standard and the dist10 source code. Multi-channel files may have up to 6 defined channels: Left(L), Right(R), Center(C), Left Surround (LS), Right Surround (RS) and a Low Frequency Enhancement channel (LFE). ISO13818 defines 5 multi-channel modes (on top of the normal stereo mode), each of these modes may have an optional LFE channel: 3/2: L, R, C, LS, RS 3/1: L, R, C, mono surround 2/2: L, R, LS, RS 2/1: L, R, mono surround 3/0: L, R, C The "standard" surround sound encoding of "5.1 channels" is achieved by using mode 3/2 plus an LFE channel. A multi-channel MPEG file should decode OK on any MPEG decoder. If the decoder doesn't recognize the multi-channel extensions, then you'll just get a stereo file containing a down mix of the 5 channels.

A multi-channel MPEG encoder, using the ISO13818 standard and the dist10 source code. Multi-channel files may have up to 6 defined channels: Left(L), Right(R), Center(C), Left Surround (LS), Right Surround (RS) and a Low Frequency Enhancement channel (LFE). ISO13818 defines 5 multi-channel modes (on top of the normal stereo mode), each of these modes may have an optional LFE channel: 3/2: L, R, C, LS, RS 3/1: L, R, C, mono surround 2/2: L, R, LS, RS 2/1: L, R, mono surround 3/0: L, R, C The "standard" surround sound encoding of "5.1 channels" is achieved by using mode 3/2 plus an LFE channel. A multi-channel MPEG file should decode OK on any MPEG decoder. If the decoder doesn't recognize the multi-channel extensions, then you'll just get a stereo file containing a down mix of the 5 channels.

Schism Tracker is a music editor that aims to match the look and feel of Impulse Tracker as closely as possible. The player code is based on Modplug, so it supports a wide variety of module formats.

SIDPlayer is a replayer program for C64 music (SID tunes). You can think of it as being a stripped-down C64 emulator that only emulates the processor and the sound chip of the C64. It also supports the SID option of the Catweasel MK3 PCI card.

The ufmcontrol utility is a program to control a radio attached to an USB port. It has the same user interface of cdcontrol(1).

Umix is an advanced tool for adjusting sound card mixers. You can adjust your mixer either from the command line or from a fullscreen curses user interface. It was designed as a replacement for Aumix.

The LinuxSampler project was founded with the goal to produce a free, streaming capable open source pure software audio sampler with professional grade features, comparable to both hardware and commercial Windows/Mac software samplers and to introduce new features not yet available by any other sampler in the world.

LMMS aims to be a free alternative to popular (but commercial and closed-source) programs like FruityLoops, Cubase and Logic giving you the ability of producing music with your computer by creating cool loops, synthesizing and mixing sounds, arranging samples, having more fun with your MIDI keyboard and much more... LMMS combines the features of a tracker/sequencer program (pattern/channel/ sample/song/effect management) and those of powerful synthesizers and samplers in a modern, user-friendly and easy to use graphical user interface.

Monkey's Audio Codec is a lossless audio codec with good correspondence of compression (and decompression) ratio and time. Monkey's Audio Codec can be used for personal, educational and non-commercial purposes. Commercial usage requires prior written permission from Monkey's Audio author. This is community-maintained Unix port of earlier Monkey's Audio sources; it does not correspond to current official SDK releases (4.x).