oh the sustain yea...ive tried it on my guitar it seems to work fine though...or it cud just be my ears....i was trying it out on my acoustic..its too late in the night here for me to try it out on the elctric...no sustain at all? hmm im pretty sure theres nothing to do with your technique at all if it rings fine on open strings..but then again im not sure...thats weird tho hunter...perhaps someone else can shine more light into this..cud it be your strings are old? ha i dont know abt that for sure...fourth fret relative to the capo yea...what if you hammeron a little harder?