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Blargg's Game Boy tests: Sound handling
Tests are at http://slack.net/~ant/old/gb-tests/cgb_sound.zip - to run one and get a description of the failed test, extract the zip file onto your storage card and load one of the ROMs in cgb_sound/rom_singles.
The first test ROM, 01-registers, passes as of commit c77c6133134fb0745ee6b711c1b70ee6f81981c2 (2013-03-12). All of the others fail very early. The general cgb_sound test ROM runs an infinite loop, not stopping when it's supposed to be done.
Generally, over 90% of the tests fail.