Mixxx is software for DJs that provides everything needed to create live mixes. It allows you to beatmatch songs and crossfade them together, like you would with turntables and a mixer. It runs without any extra hardware, and offers a wide range of advanced features including comprehensive MIDI controller and vinyl control support. To obtain the lowest latency and highest responsiveness, it uses hardware video acceleration and takes advantage of multi-core CPUs.
Mutabor is a program that allows you to perform and compose microtonal music using a normal MIDI keybord and normal MIDI equipment. Its powerful description language is intended to allow permanent retunings and complex tuning logic. One application is just tuning. Mutabor has been used for this purpose to make available all pitches that can be reached by stacking perfect thirds and perfect fifths. The stable version 3.0x is available in German only and runs under Windows and Wine. The unstable branch can be accessed via CVS (but build bugs should be expected) or downloaded from the Berlios developer site.
Impro-Visor is a music notation and playback tool for helping jazz musicians learn to improvise. It features a notation GUI, automated playback of chords and rhythm using MIDI, and improvisation advice provided in a variety of ways, including being able to improvise jazz itself. Data are stored as open-format text files. MIDI and MusicXML export are also available.
n-Track Studio is an audio and MIDI multitrack recorder that turns your computer into a full-fledged recording studio. You can record and playback a virtually unlimited number of audio and MIDI tracks. The program supports simultaneous recording from multiple 16-bit and 24-bit soundcards, and real-time audio effects can be applied non-destructively to each track. Built-in effects include Reverb, Multiband Compression, Chorus, Delay, Pitch Shift, Graphic and Parametric EQ, and spectrum analyzer. The program can use third party VST plug-ins to process audio signals in real-time. Effects can also be used to process the recorded signal in real-time. MIDI tracks can be imported end exported to regular MIDI files, and edited using the built in piano-roll based MIDI editing window. The program supports VSTi instrument plug-ins for sample accurate software MIDI playback. Volume and pan evolution can be programmed by drawing on the timeline window.
The ALSA MIDI Filter application consists of a main script, named midifilter, and supporting Perl modules, configuration files, and documentation. It runs as an ALSA MIDI client that can receive input from a source (such as a MIDI keyboard connected to the computer), perform various filtering and other functionality based on the type and content of the MIDI input, and send the result to one or more other MIDI clients.