Yes there is. Modern TVs, CD Players, etc use digital potentiometers.
I don't know the IC number, so I suggest you do a search in a IC data sheet web site such as www.alldatasheet.com and search for "attenuator" or "digital attenuator" or "digital potentiometer"
www.maxim-ic.com have lots of digital potentiometer IC's. Mono or stereo, linear or audio-taper. Some are non-volatile but I think the memory-burning part lasts only a few thousand saves. Some have a very low-power "sleep" mode where the last setting is held with battery-backup. :lol: **broken link removed**
If your looking for a digital pot for 1 wire then the Dallas 2890 is a good choice. I got a couple of samples from and when time allows I'll put them to good use.
Note: 1 application Dallas provides for the above chip is digitally controlled fluro lighting