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KGuitar is powerful KDE-based music tabulature editor with support of guitar, drums, classic note scores, MIDI synthesizer output, chord, scales, modes, melody and rhythm construction and analysis tools, lots of tab effects, Guitar Pro files import.
Easy-to-use platform-independent plugin API for the extraction of low-level features from audio data in PCM format, as required in the context of music information retrieval software.
RT Audio Processor is a free, cross platform, open-source, realtime audio processing library. The library exports a C++ API which is intended to offer flow-based programming framework for realtime audio processing.