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LM4876: Volume control with LM4876

Part Number: LM4876
Other Parts Discussed in Thread: TL971

What is the best way to control volume with a 1W speaker?

My thought is to us a digital pot as the feedback resistor in figure 1 of the LM4876's datasheet. Is this a terrible idea?

Setup: I have a hardware DAC implemented by a microcontroller port putting 8-bit samples on a resistor ladder. This DAC output is buffered by a TL971 with unity gain. The buffered signal then is amplified by an LM4876.