For those interested, Xcode lets you configure sounds to be played when a breakpoint is reached. It can also be set up to conditionally play a sound. Those breakpoints can also be configured to continue running the app instead of pausing. It can quickly get out of hands though.
I'm thinking that for up to five events (which covers a lot of ground) this would be pretty sustainable with the pentatonic scale. Any combination of pentatonics is reasonably pleasant, and it would be very easy indeed to hear a permutation in the expected melody. I think this is something I could keep doing without suddenly developing an extreme aversion to it.
It would still be necessary to use headphones to prevent casuals from being exposed, though. It wouldn't be that melodic...