Long ground runs from input jack to chassis can induce hum via magnetic pickup or ground loops. Direct-mount the jack to chassis if possible—it's the gold standard for clean signal. If not, twist/shield that wire and keep it <6 inches. Test it.
Could that cause the issue I've explained?
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Yes, absolutely—long unshielded ground wires pick up electromagnetic interference like a sponge, causing hum or buzz in your signal. Shorten or shield it to kill the noise.
The issue is that the hum increases when volume is reduced.
