I have the Line 6
and the Hog
The line 6 is great....you can set the expression to do ANYTHING!! You set the toe-up and toe-down yourself...Its great...a bit complex in the set-up but amazing once achieved. I use it to be 100% no-delay with heel down, and much delay toe-down. The trickiest part of that pedal, to me, is that you can have the effect of the delay be 100% of the sound, with NO initial playing being included, JUST the delay(s). .... .That has never been a desire of mine and is a control-knob function....a little strange!!
Still finding the delay-sound-of-choice is the everlasting battle.
The HOG freeze function is interesting...Its hold is as long as you keep your foot down on the expression pedal. The sound that the hog puts out for the processed-effect-sound is a bit more processed and un-natural than any other pedal I've heard or had. The LEVEL of the held-out sound AND the level of the original signal can BOTH be adjusted...I dig a lesser hold with the maximum original sound...
BUMMER WITH THE HOG - it is a quieter pedal when its on...Its overall output is NEVER as loud as whe it is turned off....annoying....AND when the levers are all the way up they distort...some of them.
I've seen kurt use both. Not really at the same time, I don't think. He used the HOG to play organ-like attack-less background chords behind the bass during his group with Andrew D'Angelo in Ugly Beauty (F#^@ING AMAZING I might add)....the freeze function can be 100% of the sound, so you can hold a frozen chord, prep and strum another chord, hit the expression, and the result is that there is no attack and/or silence between the 2 chords, including what you played on the guitar in-between messing with the pedal...perhaps difficult to explain...but he did that....As far as I know, his use of the expression pedal with the Line 6 has been more subtle live than on the recording. His foot is always on the expression, moving slightly...a lot....perhaps his recording mind is a little more picky or controlling/controlled than his live mind...??
Also, I can never tell what his expression is hooked up to...i've seen him with a MAASSSIIIIIVVEEE pedal setup (a few times) with several expression pedals....multiple delays... and the hog...and the rat...and the tuner...and a few lehle's..and the dishwasher....and the automatic remote car starter....and the lawn mower...
I have yet to figure out his sound....It is freakin' awesome