Tonal difference is all I noticed, and it was slight. It definitely increases the perceived depth of the effect, IMO, but not bad. my Sewer Pipes is where I really noticed tonal change concerning the delay. Between about 220R and 1.2k there was more change, and after that the waves become too separated. I don't remember that much change in the LA...
The LFO section of my LA went kaput for some reason, or I'd just check it out for sure since I have the adjustable delay. If I get it working, I'll get back to ya.