If memory serves, a tech borrowed mine and never returned it. I always grab schematics for all my gear when I come across them. NO noise unless you run your input levels to high. I use it in my live gig vocal rack with another 'dinosoar', a YAMAHA R1000 Digital Reverb.The microphone system also in the rack is a Shure SC Marcad SM Beta 87A Wireless. Ross more reviews for this product more reviews by this member. Delta lab Effectron II ADM 256 Features: Full IITKHzl Bandwidth. It never left my house, has very few hours on it and is practically brand new as I never got very deep into home recording. I had a small home recording set-up in the '80's and this was one of the delays in my rack. The Deltalab Effectron II ADM 1024 is a digital delay unit, of which I'm not sure what types of connections the 1024 has as the one that I have used was already racked up in the studio that I used it.