The MIDI controller capability of the Helix sounds great...I think that's just what users would expect out of a $1500 pro-style effects unit.
Unfortunately, I still feel that Line 6 is missing some great opportunity with MIDI implementation. I understand and accept the notion that MIDI CC control of individual parameters would be messy, if it were locked down. What I envision out of the Helix is a functionality more similar to the way one might use an amp sim plugin. For example, if I insert an amp sim on a track inside of Ableton or Logic, I can take any old generic MIDI controller and create my own mappings to control every parameter under the sun. If I want to macro a control to effect 10 different parameter changes at once, I can do so with ease. It seems that one should be able to do this with a hardware unit, and store the CC control on a per preset basis. CC 30 doesn't necessarily have to have the same effect in preset A as it does in preset B.
The confusing part about the absence of this feature is that you can essentially do similar things with the Variax controls and/or the expressions pedals. For years, PODHD users have been able to assign multiple, smoothly ramping effect changes to a single expression pedal. Wouldn't it be awesome to exert this type of control over the Helix from your DAW? Perhaps a MIDI learn feature where you can select the parameter on the Helix display, double press the joystick to enter "learn" mode, and move a knob or fader on your MIDI controller to assign direct one-to-one control. Now that would be the ultimate, for me at least. Imagine the possibilities for automation during re-amping.
I understand that you can MIDI map the expression pedals and still achieve something similar, but what I look for when searching for a place to drop my money is ultimate flexibility. Let the users decide how to customize the performance to their particular workflow.
I am still hopeful that this feature will find its way into Line 6 products.