This makes it difficult to create a single UI that works across multiple player backends. Up to now, there's been no common API for things that generate audio data, so music players for 'exotic' formats tend to implement the whole pipeline themselves, including the audio output and user interface. because it wouldn't be much of a music player without them. Players for ZX Spectrum formats are either a direct translation of the original Z80 player routines, or the Z80 player routines themselves running under emulation. For tracker music formats, we use an Emscripten build of libopenmpt, the most mature and comprehensively-tested module player library available. Getting every last detail and edge case of demoscene music formats right is hard, and so Cowbell is built on top of existing tried-and-tested playback engines. MP3, OGG (and whatever else your browser supports natively), MOD, XM, S3M, IT (and all other formats implemented by libopenmpt), SID, SAP (and other Atari 8-bit formats implemented by ASAP), PSG, VTX, STC, SQT and PT3 formats Highly accurate playback engines Working demonstration Features Support for lots of file formats Cowbell is an HTML / JavaScript audio player that can play diverse audio file formats with a common user interface, with a particular focus on the demoscene and tracker music.

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