Because the subject was raised, I have a question for technically literate people in the US... It is impossible (I'm french) to run properly either alesis or lexicon stuff with generic wall warts here. No matter voltage or polarity, it gives (on the jam man for example) a lighthing of all leds to red, all led segments on and nothing working. Id with the vortex; id with a midiverb 3. I checked everyhthing i caould (polarity, voltage) and found nodiférence with the usual ones... An alesis one will work perfectly on the lexes and visae versae. I don't get where is the difference... the same wallwarts work perfectly with any other brand (?!?!). Trouble is I f I want a buy one from alesis for example, here it is 50 dollars. Which is quite expensive...