On all early Bally SS, the lockout coil turns off just before the bonus count, then turns on again at the start of the next ball. You can hear it clearly. On Paragon, it turns off while the ball is in the Golden Cliffs saucer (no idea why), and I'm sure some other Ballys have similar quirks. If you're used to the coin-op experience, the lockout sound is a part of that, and you notice when it's missing. That's why I keep it on mine, but if you don't remember the game on location then it doesn't matter.