Doepfer a-157 set

A-157 is a trigger sequencer subsystem that generates eight trigger signals controlled by a 8x16 LED/button matrix (some customers call it "Miniature Schaltwerk" as it is based on the same matrix as the no longer available Schaltwerk). The subsystem contains three modules:

A-157-1: 8 x 16 LED/button matrix and function adressing buttons/LEDs

A-157-2: Trigger Output module

A-157-3: Control Inputs module

The LED/button matrix module A-157-1 is the core of the subsystem. It is used to set or reset the trigger event on each of the 16 steps of each of the 8 rows. In addition the buttons and LEDs of the matrix are used for other functions too (like setting the first and last step of each row or adressing the preset memory). The Trigger Output module A-157-2 outputs the 8 trigger signals and has an LED display for each trigger available. The Control Inputs module A-157-3 has manual controls and trigger inputs available for the basic control functions start, stop, reset and clock. In addition four functions inputs are available which will be used in future firmware versions to assign these inputs to special functions (e.g. shifting a row left or right by means of an external gate/trigger signal or a second set of start, stop, reset and clock for individual rows).