TSE3 (Trax Sequencer Engine v3) is a powerful open source sequencer engine written in C++. It is a sequencer engine because it provides the actual driving force elements of a sequencer but provides no form of user interface.
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A number of new features have been added, including progress reporting of slow operations for application feedback, DisplayParams class now provided with a range of PresetColours (for things such as intro/verse/bridge), and a Song 'Modified' utility.