So I learned that direct boxes match impedance, and that this alters the tone of an instrument. So I set out to test this for myself, and this is what I've come up with: Direct Injection Experiment MP3 First guitar sample is with a modeling processor* which has an "amp/line" switch. The second guitar sample is without the processor. Pattern repeats for all three experiments. The same guitar line was played three times. Each time the processor was used first, and then not used. Signal chain: A) Ibanez SZ 320, guitar cable to M-Audio Delta 1010, multi-pin cable to M- Audio Delta 1010 soundcard in HP Pavilion PC. B) Ibanez SZ 320, guitar cable to AX10B, guitar cable to M-Audio Delta 1010, multi-pin cable to M- Audio Delta 1010 soundcard in HP Pavilion PC. *The processor may or may not match impedance, and the results may not be valid. My intention is to try and gain understanding of a real direct box and the sound changes. I want to begin again with an uncomplicated, simple, direct injection box.