answer:For casual audio editing on OS X, most people I know seem to use Garageband (plus maybe a little Audacity). Because Garageband is pretty decent, free, and built in, I’m guessing it’d make for a tough competitor. There is Sequel, which is Steinberg’s low-end alternative to Garageband, but I haven’t heard anything about it. Now, once you go to a more professional level, there are lots of options. But I find myself pretty content with Garageband.