Is there a term of art or in common use for ringing all three chimes or bells (for a three chime game) simultaneously?

When you have 999 for example and hit a single 1 pt bumper (on an older machine) - all three chimes sound together. It feels like a little bonus to these old EM games - hitting two chimes together (1s and 10s, or 10s and 100s) happens all the time and is very sweet, but catching all three together, with a single tone, needs the point total to be right and then hit the lowest scoring target or bumper (not always easy, the middle range point targets are often much more common).

I confess to setting it up occasionally when I have the glass off and doing some troubleshooting or tweaking, but when it comes during a normal game it feels special.

::laffin:: challenge accepted. It helps that my desk is sitting about 5' from Mr. Duotron and I have an instrument tuner app on my phone. And clearly whatever is on my to-do list this afternoon is not all that urgent.

10 - G / 3136 Hz
100 - E / 1318 Hz
1000 - B / 493 Hz

Which gives you an Em chord, more or less....