Sony VPLL-3024 Fixed Short Throw Lens (2.34:1 to 3.19:1) - Manual (Page 65)

When [Auto Gain Ctrl] is selected for [Built-In Mic Sensitivity], you cannot use the Rehearsal function. Select [Yes] when [Change
Sensitivity Setting to Manual to Start Rehearsal Mode?] appears on the display window.
You can also use the Rehearsal function on the smartphone app, REC Remote.
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