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Renoise, music production software.

I've found it to be exceptionally stable and responsive; changes propagate with live feedback right throughout the GUI.

I'd really like to see if its qualities are the result of great software design, or just brute force and hammering away at it until the bugs are gone. It strikes me it would be hard to achieve with the latter.

If the architecture is good, whether it is a textbook use of C++ with objects, inheritance and templates, or something more modest/bespoke.