The STC-9000 has a switch for +10 or +30 gain, a output control knob, and a high pass filter switch(in the batt compartment). the output can be adjusted during recording, just had to do that yesterday where I had it too loud for an onstage recording. cabling should be 1/8" miniplug > whatever input your recorder has.
I can't vouch for your recorders ability to handle the signal but you are on the right track with the STC-9000. I used to record CA-11s > STC-9000 > JB3 and the STC was really the strong point of the rig because the JB3 recorded at low levels and had terrible level meters. Now I use CA-14s > 9000 > Tascam DR-05 or DR-07. the tascam units are great for their prices, i would recommend looking into one. i dont believe any MD recorders can do 24 bit, which can be necessary in post if the levels are too low.