I recently purchased an HD-500 and I'm still in the learning stages. In trying to reproduce some of my favorite X3 live tones I need to use EQ. Last night I became very frustrated with the lack of Line 6 documentation for EQ parameters and responses; the "trial and error" method was really trying my patience. Needless to say, your documentation plus MeAmBobbo's website (which is great!) posting is like a breath of fresh air! I agree with Astroth_CY's comment - Line 6 should be paying you for doing their work.
Line 6: Great products MINUS adequate documentation = mediocre service! Invest in the time to better help your customer base, most of us don't hold degrees in sound engineering. P.S. Still like your products.