The A-100 system bus also carries the internal control signals GATE and CV. Here some important remarks concerning the usage of the internal CV and Gate lines of the A-100 bus:

• The main function of the bus is the power supply of the A-100 modules (-12V, GND, +12V and additional +5V for a few modules)
• in addition a CV and Gate line are available
• some modules can pick-up the CV signal (e.g. VCOs like A-110-x, A-111-x or the modules A-111-5 and A-143-4) from the bus depending on the jumper setting on the module
• some modules can pick-up the Gate signal (e.g. envelope generators like A-140, A-141-x or the modules A-111-5 and A-111-6) from the bus depending on the jumper setting on the module
• other modules may work as transmitter for the CV signal to the bus (e.g. A-190-1, A-190-2, A-190-3, A-190-4, A-185-1, A-185-2) depending on the jumper setting on the module
• other modules may work as transmitter for the Gate signal to the bus (e.g. A-190-1, A-190-2, A-190-3, A-190-4,  A-185-1, A-164-1) depending on the jumper setting on the module
• most of the A-100 modules have no access to the CV or Gate signal of the bus
  pay attention that only ONE transmitter for CV and only ONE transmitter for Gate are allowed (otherwise modules may be damaged)
• but several modules may pick-up the same CV or gate signal from the bus (e.g. three A-110-1 and two A-140)
• using the internal CV and Gate lines of the bus is optional (one may also patch the required connections via the sockets at the front panels)
• but using the internal CV and Gate lines may simplify the patching at the front panels (e.g. if several VCOs have to be controlled by the same CV, in this case the A-185-2 is recommended as CV transmitter to the bus, the A-185-2 allows also common octave switching and common frequency modulation of all VCOs as well as CV summing, e.g. from a sequencer and CV keyboard or Midi-to-CV interface)
• if no CV transmitter is installed on a bus board we strictly recommend to remove all bus jumpers of modules, which are able to pick-up CV from the bus (especially VCOs). The unused CV line of the bus board may work as "antenna" for undesired interference signals which affect the VCO pitch. Only if a CV transmitter has been installed on the bus (e.g. a Midi/USB interface A-190-x or a bus access module A-185-x), the jumpers for CV pick-up should be installed on VCO modules.
• both the CV and the Gate line can be interrupted in the middle of the bus board to establish two different CV/Gate areas. For this the corresponding jumper (J1 and J2 in the above picture) has to be removed.
• A special CV/Gate bus connection cable A-100BC is available. This cable can be used to connect the CV and/or Gate lines of two different bus boards. To connect the two boards the pin headers J1 and J2 of the two bus boards may be used. But it is also possible to connect the corresponding pins (INT.Gate or INT.CV) of other unused bus connectors (labelled 1...14 in the following picture).