In SX Microcontrollers, SX/B Compiler and SX-Key Tool, g_daubach wrote:

You might use digital potentiometers, like the DS1803 dual digital potentiometer from Dallas to remote-control the volumes. The DS1803 is controlled via I²C. Although the I²C bus is normally used to control devices on one PCB, or on several PCBs close together, I have used I²C over lengths of a couple of meters w/o problems by using a reduced bit rate, say 10 kBit/s instead of 100 or 400 kbps.

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