The A-149.2 is an extension module to the A-149.1. It makes available 8 digital random voltages (i.e. only low/high states like a gate signal).
The outputs are controlled by the assigned A-149.1 and correspond to 8 digital outputs of the shift register that is used to generate the Quantized Random Voltages.
As the A-149.2 outputs are clock controlled (controlled by both Clk In of Quantized and Clk In of the Stored section of the A-149.1) the A-149.2 can be used to create random rhythmical sequences.
The A-149.2 requires the A-149.1 and has to be mounted directly to the left or right of the A-149.1 as an internal ribbon cable connection has to be established between the A-149.1 and the A-149.2.