Hi, selling my Roland R-70 Human Rythm Composer. It's in mint condition both cosmetically and operationally. Was always used in a smoke-free and pet-free environment. Comes complete with power supply, owner's manual and user's guide. Asking $300

If you're looking at this ad you probably have a good idea what it is.

Review from VintageSynth.com:

The R-70 is a full sized and very popular all purpose drum machine. Sounds are based on digital sample-playback drums which are all very good sounding and usually convincing. The R-70 features up to 210 drum sounds, total, covering various forms of Rock, Jazz, Electronic, and Ethnic kits.

The R-70 is highly programmable. It can hold 100 patterns which can be created in realtime or step input. Patterns can be chained into songs, 20 maximum. Many advanced editing functions for a drum machine are used in its pattern and song sequencers. It also has a unique positional pad which allows you to assign any sound to it. It is a big pad that changes its sound depending on where it's hit.

Roland R-70 Human Rythm Composer*: un album sur Flickr

See complete review: http://www.vintagesynth.com/roland/r70.php