Dip switch legend for the production boards :
dips 1-5 : low pass filter
1: 1nF : significant low pass filter
2: 4.7nF : heavier low pass filter
3: 10 nF : very heavy low pass filter
4 : 0.1nF : very subtle low pass filter
5 : 0.47nF : subtle low pass filter

dip 6-7 : extra volume divider :
6 : 56k (1/2R)
7 : 27k (1/4R)

dip 8
8 : bypass coupling capacitor

--

from http://www.vogons.org/viewtopic.php?f=62&t=51483&start=320#p587204
Grabbed 2017/06/02

--

Updated 2017/06/07 for original 6 boards

Dip switch legend for the production boards :
dips 1-5 : low pass filter
1: 1nF : significant low pass filter
2: 4.7nF : heavier low pass filter
3: 10 nF : very heavy low pass filter
4 : 47nF : super heavy low pass filter
5 : 100nF : heaviest low pass filter