I don't completely understand how the scsp timers work; "8192" is a magic number I came up with by experimentation.
The sound_cpu example works consistently on all emulators and real hardware now.
This demonstrates the most basic possible SCSP usage. Strangely this does not work in Kronos, only in mednafen and on real hardware. I'd like to find a hack, if possible, that fixes Kronos playback.