I've known a lot of people who have had trouble with their DL-4's crapping out...weather it be the cruddy switches screwing up or the expensive power pack going out
A friend of mine recently started modding them...
He fitted mine with better switches,
blue and pink LED's
BUT, he also does the tone/volume mod like keeley does
as well as powder coat jobs on them
$45-Powder coating (unscratchable)
$20 for any color LEDs
$35 for better switches
$25 volume Mod
Here's some pictures of the powder coatings, new LED's as well as the new switches
He's based out of Fort Worth TX...and I'm not sure how he handles out of state shipping, but if anyone in area needs their DL-4 modded or repaired...let me know and I'll get you in contact with him...
as for the crappy power packs...i've ditched mine for a godlyke adapter...you can find them on ebay for around $3....there may be a small bit of volume difference, but i have barely noticed it...