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As for finding things online, I don't know a single guide or book for "how to make DAW software", because it's a very complicated and multi-disciplinary task (i.e. you're gonna need more than just software engineers), but one may exist. Failing that, a good place to start would be reading up on commonly used software frameworks for building audio processing applications (JUCE is one, https://juce.com/), and maybe reading up on the specs of whatever plugin format(s) you want to try and support (here's the VST2 spec https://jvstwrapper.sourceforge.net/vst20spec.pdf), and this will start to give you an idea of what might be required to get started.