1U Tile attenuator with linear taper potentiometer.
This is a passive attenuator using an Alps 50k linear taper potentiometer. The Atten-B tile can be used to scale audio or control signals, however it is most useful on control signals where it is often desirable to have the potentiometer rotation follow a linear scale.
http://pulplogic.com/product/atten-b/
No info about availability.
Module is a 1U tile in Pulp Logic format
$15