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- -The settlement of the volume can adjust four steps which grows big in order of 1 - 4.
- (Turn off the number which isn't used.)
- -Use the settlement of the volume with 1 or 2.
- At this time, be sure to leave a speaker from the microphone beyond 5 cm.
- -Take 3, and use it when it thinks that volume is still small.
- At this time, be sure to leave a microphone from the speaker beyond 30 cm.
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