via this auction
"Great little controller for CV sequencing.
module a-154 is a supplement to the a-155 analog/trigger sequencer module. it offers a lot of new features that are not available in the basic control unit of the a-155. the a-154 is used to replace the control unit of one or two a-155, i.e. the section marked "control" with start / stop / step / reset buttons and inputs in the upper left corner of the a-155 front panel. if the a-154 is used to control the a-155 the control section of the a-155 is put out of action.
these are the features of the a-154:
* several running modes: forward, backward, pendulum, random, cv controlled step adressing. all modes are available as loop or one-shot.
* led display of the 5 different current modes and one led for loop/one-shot display
* manual and voltage controlled selection (with attenuator) of the running mode. if no external control voltage is applied one of the 10 modes (5 modes x 2 loop/one-shot) is simply selected with a rotary knob. the cv input with attenuator is used to modulate the running mode with an external control voltage (digital high/low cv to switch between two modes or continuous analog cv to sweep through different modes). with the combination of manual control and cv with attenuator it is possible e.g. to use only two neighbouring modes (e.g. forward/backward) or sweep through all possible running modes
* manual and voltage controlled selection (with attenuator) of first and last step of the sequence. the range is step 1...8 in 8 step mode resp. 1...16 in 16 step mode
* if the running mode "cv controlled step address" is selected the first step section is used to determine the active sequencer step. consequently manual and voltage controlled selection (with attenuator) of the active step is possible: the active step can be set by hand with the first step manual control and then modulated by an external control voltage (e.g. lfo, random, s&h, theremin, light cv source, joy stick) at the first step cv input (with attenuator)."
