With the KBD Set button active, each variation selected auto the next OTS voice.
This must be a bug because there is a delay even after next bar has started for the next OTS to sound.

Way around this is to touch any of the on screen 4 keysets.

Anyone with a Pa1000 please check. I'm told this does not happen on Pa700.

REPLY FROM KORG.

There is a setting to adjust the behaviour of the instrument with regards to this. It can be found under the Global -> Mode Preferences -> Style 1 page. If you select the “Immediate” option, the Pa1000 will select the corresponding Keyboard Set as soon as you select a new Style. With the default “Next Measure” setting, the next Keyboard Set will only be automatically selected until the first beat of the next bar/measure.

Great job following up with Korg, and sharing their response with the Forum! Thank you!!