RADIAL
Radial EngineeringRainsongRamirez
RandallRaneRaven
RaxxessRDLRecorder
Recording KingRed WitchRegal
ReinhardtReloopRIVERA
RJ Technology IncRMERoad Runner
Rockman GuitarsRocktronRode
Roger Linn DesignRoger MayerRogue
RolandRollsRoyer Labs
RSQ AudioRycote