The Access Virus Indigo TDM is a virtual analog synthesizer and multi-effects processor developed by Access Music. It is designed to be used in a Pro Tools TDM environment and features a powerful sound engine, a wide range of effects, and an intuitive user interface. The Virus Indigo TDM is capable of producing a wide range of sounds, from classic analog synth sounds to modern digital sounds. It also features an integrated arpeggiator and a step sequencer.