This video will show you how to eliminate the buzzing noise of Spark 40 Watts Amplifier by using the built-in Noise Gate.

If the noise is still there even though you activated the Noise Gate, you may try to Reset the unit to its Factory Default and Upgrade the Firmware. I have a video for that, you may check this:
[ Ссылка ]

After you tried the Noise Gate, Reset To Factory Default and Firmware Upgrade; and you still have the buzzing noise, you may also check your Guitar and its cable that might cause the issue.

If the procedures above unable to solve the buzzing noise, you may contact Positive Grid for the support to verify if you have faulty unit.

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