Doing some quick checks it appears that the voltage on pin7 of the Fuze controls the lineout level. The Griffin Dock feeds 5volt through a series 47k resistor and has 1 volt on pin7. My modded cable feeds 3 volts to pin7 and produces a louder output signal. The Griffin Dock can be modded for a higher than 1 volt feed with a reistor change, or a pot and resistor could be used to produce a voltage limited gain control. I would imagine that the feed should not exceed 3 volts, so values must be chosen correctly if modding the dock due to the 5 volt feed. I do not have a Sansa Dock, but it seems to be more involved internally than the Griffin Dock. I’ll be trying mods on the Griffin Dock in the next few days.
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