In my case, I use the keyboard's onboard vocal processor, plus the Digitech VR, and on both I use a low level of reverb. The Bose L1 PA does not use reverb--just EQs.

Works for me,

Gary

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

K+E=W (Knowledge Plus Experience = Wisdom.)