The Simmons SDS 5, SDSV, or Simmons Drum Synthesizer (notated as SDS-V on the following) was the first viable electronic replacement for acoustic drums. It was developed by Richard James Burgess and Dave Simmons, manufactured initially by Musicaid in Hatfield, UK, and commercially released in 1981. After Musicaid went bankrupt, Simmons set up a new manufacturing company under his name, Simmons.