I have some advice, but first I must ask: Are you good with electronics? One would be able to make a volume amplifier that is hooked in parallel with the track, and a potentiometer to help regulate volume. It would take a little designing, but if you're good with tech and willing to take some advice, just send me the specifications about voltage and dimensions. (I have two K-line MP-15's, NYC and UP, so I'll have a visual aid to help you by)
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