tom's ms-20 filter help

[michael]

i'm a little confused by the schematic and board layout (hey, i'm trying :)

http://www.geocities.com/efm_gc/cbook/pics/vcf8b_sd.gif
http://www.geocities.com/efm_gc/cbook/pics/vcf8b_pc.gif

is the "lo/hi" on the schematic supposed to be an attenuator switch,
selectable low/high pass per input, or something else?

btw, thanks for all the info in reply to my previous post!

michael