In Preferences Audio tab enable Quick Volume Change check box.

Or if it is enabled, uncheck it; some people find it works better one way than the other. Also there is a setting there for output buffer you could tinker with.

Before making any more suggestions, what is your sound source? Audio tracks?
Or MIDI with a VSTi, MSsynth, .. or ?
If MIDI, try sending the MIDI from Realband to that Korg. That should respond very quickly.


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