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I think it's the other way around, LazyGecko. Lo-pass filter means that the low frequencies "pass" through while the higher frequencies are attenuated, and vice versa for HPF's.

The LPF cuts the highs from the blended clean tone. Try putting the blend at 0% and playing with the LPF knob to hear the difference. One application of this is to cut your transient attack (the plucky/clicky noises you make when you play) from your clean signal so you get your original bottom end with only the top end of the distorted signal.

The HPF cuts lows from the dirty signal, the effect of which is best heard with Blend at 100%. It's a bit stranger of an effect and can help you get different harmonic content out of your distortion.

When I had my DBBM, I only really used the LPF and left the HPF alone as I liked the regular distortion tone.