AL.SO M2B is a summing module for the 500 series, manufactured by AL.SO.
History[]
The AL.SO M2B was announced in 2007.[1]
Official description[]
The Al.So M2B is a summing module with 4 stereo inputs to one stereo master. The M2B has Mute controls for each stereo pair. Up to 6dB gain for the master out. Odd inputs are routed to the left output and even inputs to the right. Pan are made into your DAW and all the automations are still valid.[2]