Available as an assembled Module and as a DIY project.
This Module is currently available.
The ES01 is based on the 1973 RANDOM SOURCE module which itself was literally a combination of the NOISE SOURCE and the SMOOTH & STEPPED GENERATOR boards internally linked to form the RANDOM SOURCE.
The ES01, however, is a brand new re-design of the original RANDOM SOURCE.
The ES01 produces random voltages which vary smoothly or in a step-wise manner. Random timimg pulses are also available form the [TIMING] output.
The rate of change of all outputs is voltage controllable over a wide range.
It is quite feasible to patch an ES05 and ES15 to achieve the same results :-
http://www.elby-designs.com/contents/en-us/p1205_ES01_-_Random_Voltage_Generator.html
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These merchants probably sell this module. Huh?