The programmable digital audio toolbox B40 is a professional studio and broadcast device for simple processing of 4 digital audio channels. Operators often need to have rapid access to a SDI flow and the matrix handles HD/SDI; SDI; AES in and outputs and integrates clever Auto Fades when changing presets but also Delay and In / Output Level corrections. It is easy to change, process and rearrange up to 4 signals with the audio toolbox B40. Level corrections for stereo or quad mixes, channel swapping, fades are efficiently and rapidly done. The four channel configuration matches the audio capability of digital VTR's and can be used as remote and programmable audio breakout box in digital video systems.