After 3 months of not touching any of my circuits, I just hooked up the jack alone, plugged it into my amp, and it sounded good. It doesn't sound particularly "hot," though it probably is still louder than my guitar would be. Would it really be destructive if I didn't cut down the signal? How can I measure the strength of the output signal with my multi-meter, and how low should the signal be?
I find this question important, because although I have a soundboard and guitar amp to run gear though, I would like the option of plugging my CBOs directly into my Macbook (and y'know, I'd hate to blow the line inputs on that).