Fig. 4.2: Routing and use in USB mode 2
Your B-CONTROL sends MIDI data to the computer and receives parameter feedback, provided that the software you are controlling supports this function. MIDI IN and OUT A are available as a 16-channel MIDI interface for your computer. OUT B functions as MIDI THRU and forwards MIDI IN data unchanged. OUT B is not accessible from the computer, and doesn’t send any control data from the B-CONTROL. This mode is ideal for applications in which you control music software on your computer and at the same time need a USB MIDI interface with one IN and one OUT. Additionally, a MIDI keyboard can be tapped into at the MIDI THRU (OUT B) connector. This way, you can use a master keyboard to import your arrangements into the sequencer, or to play back software synths. OUT A controls a hardware sampler, while a MIDI expander (sound generator without a keyboard; e.g. a rack synthesizer or a pure preset unit), an effects processor or similar can be connected at OUT B, whereby it is directly controlled only from the keyboard or is controlled only via program changes.
Fig. 4.3: Routing and use in USB mode 3
This is surely the most often used “standard mode” with computer applications.
This setting is optimal for controlling software while all MIDI connectors are used as a USB-MIDI interface for the computer. With this function, there are 16 input channels and 32 output channels available to your music software (IN and OUT A + OUT B).
The B-CONTROL transmits its data via USB to the computer. The availability of parameter feedback from the computer to the B-CONTROL depends on the software your are controlling. MIDI expanders can not be directly accessed from the keyboard in this operating mode. This operating mode is only used to import MIDI tracks into the sequencer.
FADER 
ROTARY BCR2000