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From BASS MIDI
Plugin system
As well as providing dedicated stream creation functions, BASSMIDI supports the BASS plugin system, adding MIDI file support to the standard BASS stream creation functions: BASS_StreamCreateFile, BASS_StreamCreateURL, and BASS_StreamCreateFileUser. This is enabled using the BASS_PluginLoad function.
MIDI streams created via the plugin system use the device's sample rate, equivalent to using freq=1 in a BASS_MIDI_StreamCreateFile call.