You can build a floating passive atten with two jacks and a knob. Cost about $2 if you've got a soldering iron already. See the original instructions over there http://www.doepfer.de/DIY/a100_diy.htm . of course it assumes some electrical know-how, and mine looks like a ball of duct tape. Still super handy to have a one-off inline 0HP solution for things that CAN be passive like attenuation or low-pass filtering.