I'm not officially lost!
Ive got a AD5235(http://www.analog.com/static/imported-files/data_sheets/AD5235.pdf) for replacing the volume dial in my audio amplifier.
I've got the thing wired up and coded as per this tut - http://www.arduino.cc/en/Tutorial/SPIDigitalPot#.UwdMqHna7wN - but it doesn't work. I see no change on the wiper reading.
I've tried using this one as well - http://www.reigndesign.com/blog/controlling-a-10-bit-digital-potentiometer-via-spi-with-arduino/
And, I've also tried this replicating this once - http://forum.arduino.cc/index.php/topic,85837.0.html
All to no avail.
This is all part of a home cinema project, and everything else is working bar this last bit.
Can someone offer me some support?