It's not that SA voices need a different action, it's just a different playing technique that is required to make them do those special things they were designed for. You can find this information by merely pressing the information button for those specific voices.

Gary cool
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!