Keep in mind that by using the Mic/Line In input of the keyboard offers you a lot of advantages, particularly when you are an OMB performer/entertainer. First and foremost, you get all the benefits of the vocal effects from the TC Helicon and the arranger keyboard, and bring them both through the same output.
Next, you don't need to haul a mixer around with you, which is just one more thing to go bad when you least expect. (Don't ask how I know this.

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Now, when the crowd noise increases, you only have to worry about one gain control, the main one on your keyboard. No worries with the PA system/amp, unless you crank everything up too high and overdrive the PA/Amp. It's pretty unlikely that after correctly setting and balancing the keyboard volume and mic volume, properly, that they will need to be independently adjusted again during a performance.
Hope this helps,
Gary
