NES APU tests on different emulators

here are some high-quality recordings of these tests from different emulators.

there are still many emulators to test, but so far the ones that have been tested are:

• Famtasia
• FCEUX
• higan
• NESHawk
• NES Mini
• puNES

a note about Famtasia

be careful when listening to the Famtasia recordings, especially the triangle one. they sound spooky.