A former manufacturer of Eurorack format modules for modular synthesizers. Plan B's adoption and advocacy of the Eurorack format in the early 2000s marked the beginning of the boom in that format. Plan B was noted for its triangle-core Model 15 VCO, and its West Coast design aesthetic. (The company's owner, Peter Grenader was a protege of Morton Subotnick.)
Plan B collapsed in 2009 amid accusations (with accompanying Internet drama) that pre-paid orders were never shipped, and modules sent in for repair were not returned. Through the decade of the 2010s, cEvin Key's Subconcious Communications re-issued a few of the Plan B modules under license, in order to raise money to repay the wronged customers. All of the claims have now been repaid, and the reissue modules are no longer available.