Strange pulse through Spark
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Getting a strange pulsing, almost like a subtle tremolo, but without any such effects active. I thought it might be a stomp box in the line, so I removed all other boxes/effects and used my best shielded cable. Still there.
I don't have a second guitar to try but what I have is a low-end Gretsch Electromatic with passive pickups. I also don't have another amp to try. I could get together with other musicians I know but thought I'd check with a Spark-specific group first.
Any ideas?
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It's the two red flashing lights on top of the amp--the flashing tuner and preset lights. These two lights flash out of sequence and cause a pulse in the output, both on headphones and though the speaker. It isn't much but it's obvious in quiet practice situations. There's poor shielding somewhere.