Have any DL4 users cracked open their Line 6 expression pedal yet to see what's inside?? I'm wondering if a regular volume pedal (Ernie Ball, Boss), or even other types of expression pedals (EV5) could be modified to behave like a Line6 expression pedal when connected to the DL4. I know that Boss claims the FV300L (the low impedance version) can act as an expression pedal when used with a special cable (stereo cable??), but I'm not sure if this would be especially effective since I have heard some EV5 users say the EV5 works great with the DL4, and other users say it does not always work. Is it a straightforward electronic component issue, or is the DL4 calibrated specifically for the range of the Line6 expression pedal??? I really like the big Boss volume pedals, and I would love to use one with my DL4.