question re: level knob on old sp-spsb mini 9v battery box

[red]

I'm hoping someone can help with my question.  I have an old sp-spsb-# (?) mini 9v battery box I picked up a long time ago for pennies in the yard sale.  (I'm not sure of the correct #, the seller id'd it as a sp-spsb-3).  It has a level control knob like the one pictured here:  http://www.soundprofessionals.com/mas_assets/full/SP-SPSB-2.jpg

I will probably run this into my Tascam dr2d, and don't want to use the battery box level controls - so practically speaking, does this mean I turn them all the way "up" as far as they go, or "down" as far as they go?  Thanks in advance for any advice.

[fmaderjr]

Turn the control all the way up-the control only provides attenuation. No amplification.

[red]

thank you!