Some observations:

A-149-1 Quantized/Stored Random Voltages:
- N+1 output never "jumps" - it repeats the previous value or changes
to next lower of higher value.
- 2^n output never gives same value twice in succession - expect for
the lowest and and highest possible values, which it repeats quite
often.
- "Equal probability distribution" output has some "personality" too.
- "Adjustable probability" distribution output makes distinctive
patterns: For example, if D=0, then the output typically jumps up and
then settles down in succesive steps. If D=10, this is mirrored.

A-149-2 Digital Random Voltages module:
A-149-1 knobs don't affect A-149-2. Outputs 1 to 7 are "echoes" of
output 8. In this order:
8 => 7 => 5 => 4 => 2 => 1 => 3 => 6
For example, output 5 is two clock cycles behind output 8.

(I assume, I would prefer more "true" randomness.)

Best regards
Jari Jokinen