Bummer! I was looking hard at these too. I hope they get it sorted out over at Boss.My wl-20 arrived and will quickly be going back. Plugged in to my G&L L2500 nothing but a rhythmic thump thump thump every second. Does this whether in passive or active. Plugged in to my Pedulla Pentabuzz there is a very noticeable high pitched whine. Plugged in to my Sire P7 it is the quietest but not silent like a power cable. Haven't tried my Tobias yet. Too bad. I had high hopes for these new Boss units but alas.