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Search for an app. note (AN737) in the Microchip website. This app note may not answer all of your questions, but it may give you some idea to get started. This app note shows how to apply a digital potentiometer MCP42100 (the idea can be applied for other digital potentiometers) to design low pass adjustable filters.
A good hi-fi solution is the Wolfson WM8816 IC. The design is based on resistor chains with external op-amps.
The gain of each channel can be independantly programmed from -111.5dB to + 15dB through a digital serial control interface.
I've been working on a digital volume control. The cheapest and easiest way was to raise the ground of the load and use a counter conected to a 8->1 analog switch and finally a darlington driver to pull down the load and a series resistor to real ground. Works fine and can be implemented with CMOS logic with a 3V3 lihtium cell / super capacitor and still have memory!!!! you can implement with any number of taps....
I hope this helps...
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