Behringer FCB1010 User Manual

18
MIDI FOOT CONTROLLER FCB1010
4.2.4 Running Status
Since the MIDI standard uses a serial transmission format, i.e. transmits data successively, it was soon found
that the transmission rate is too low if the system is exploited to its full capacity. To make up for an audibly
delayed transmission of MIDI data, the so-called Running Status was introduced, which suppresses the status
byte in two or more identical MIDI messages that follow each other. For example, if the data bytes of a
controller (e.g. volume) are changed continuously, the corresponding status byte is sent only once. Only the
data byte changes are transmitted, as long as another status byte is sent, i.e. in each message transmitted
you can eliminate 8 bits. This is also the reason why NOTE OFF messages are no longer used. When a
keyboard player plays a scale on a keyboard and sends these data via MIDI to a computer, each NOTE ON
message would be followed by a NOTE OFF message, each time a key is released. The Running Status would
identify the NOTE OFF message as a new status byte and hence send it, which results in a data amount of 8
notes times 8 bits, i.e. 192 bits. Since NOTE ON messages belong to those MIDI messages that are used
most often, it was decided to send NOTE ON messages with zero velocity instead. The audible effect is the
same, but in the Running Status the data amount can be reduced by 7 times 8 bits, i.e. 56 bits. As a
consequence, the overall data amount produced by the scale mentioned above is only 136 bits. With the
FCB1010 you are free to switch the Running Status feature on or off.
5. APPENDIX
5.1 MIDI Implementation
MIDI Implementation Chart
Function Transmitted Recognized Remarks
Basic
Channel
Default
Changed
1-16
1-16
Mode
Default
Messages
x
x
x
x
Note Number 0-127 x
Programmable
1-128
Velocity
Note ON
Note OFF
0,64
x
x
x
After Touch
Keys
Channels
x
x
x
x
Control
0-127
x
Progr.
Change
True #
ox
Programmable
1-128
System Exclusive
oo
System
Common
Song Pos.
Song Sel.
Tune
x
x
x
x
x
x
System
Real Time
Clock
Commands
x
x
x
x
Aux
Messages
Local ON/OFF
All notes OFF
Active Sense
Reset
x
x
x
x
x
x
x
x
Notes
Soft Thru / Merge Function
O = YES, X = NO
Mode 1: OMNI ON
Mode 2: OMNI OFF
Tab. 5.1: MIDI Implementation
5. APPENDIX

Behringer FCB1010 Specifications

General

Type	Controller
Proper use	Concert/Studio
Product color	Black, Grey

Weight and Dimensions

Depth	687 mm
Width	221 mm
Height	60 mm
Weight	4340 g