Zoom H4essential Operation Manual page 58

HINT
The test tone is a 1kHz sine wave at –20 dBFS.
5.
After adjusting the input gain of the connected device, press
This stops test tone output.
NOTE
• See the manual of the connected device for information about its operation.
• If the automatic gain control function on the other device is on, turn it off.
• The level adjusted here does not affect the recorded audio or the audio level output from the USB port.
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