Available as an assembled Module and as a DIY project.
This Module is currently available.
Coarse / Fine control attenuator
Attenuator with both Coarse and Fine controls.
The Fine control operates on the output of the Coarse attenuator and allows the full rotation of the knob to control just 13% of the signal
Great for tuning VCOs to a specific frequency based on a CV signal. For example: precise pitch shift when driven from an envelope generator or LFO
http://database-help.co.uk/mheurorack/coarse-fine-attenuator