This circuit is especially designed for those who are not satisfied with a single, fixed volume level for their Audio DAC 2000. Minimal modifications to the DAC circuit board and a simple processor circuit are all that are needed to add a de luxe pushbutton volume and balance control. An adjustable preset is even included!In part 2 of the description of the Audio DAC 2000 (Elektor Electronics, December 1999), we already briefly mentioned that the DF1704 digital interpolation filter includes a digital attenuator that can be adjusted under software control. We more or less suggested that this feature could be used very well in combination with an external processor to realise a digital volume control.