The Devil said:

One is stimulated by a good volume control, you will note. I'm kinda
torn on the relay attenuator because I'm willing to bet my work will
be cut out obtaining a rotary encoder that has a nice action. Maybe I
could fill it with oil and fine grit. Or maybe use an A/D convertor
and a single-gang Alps to potentially divide a voltage reference. :-)

http://catalog.sensing.honeywell.com...293 73,529374

The 600 series has the same feel as a BB Alps.
Nice specs as well.

--
Sander deWaal
"SOA of a KT88? Sufficient."