The level controls the main output. The volume adjusts the 6.5mm output. You have to say it clearly! Then the gain appears after 7, and before that it was just a volume limiter. The power of this thing is not very high, the boost gives a little between 7 and 9, overdrive between 9-10. Does electrical noise ever occur during amplification, is it due to static electricity? If the input connects the RCA to the 3.5mm wire but is not connected anywhere, there will be a lot of electrical noise. Note: This thing adds too much bass and bad highs and probably isn't used for normal linear amplification.
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