A very useful box,with which you persuade your midi system to do what you want it to. I have two Doepfer Maq 16/3 Analogue sequencers which can send continuous control change data as well as note information, the only problem with the Doepfer is the control channel numbers are not the same on the synths I have, I can programme the midi solutions midi event processer through a P.C, and it allows me to convert the control channels sent by the Doepfers to the control channels that my synths respond to, it works really well.