I've listened to that video carefully. That is NOT adding white noise to a vocal, as you described. That's an impulse sort of reverb. You take an event and create lots of separate reflections from it. It is very common as an effect - and I don;t have edison, with blur - but that kind of effect is usually a preset in most reverb packages - I've used it myself to make pads for years. I've no idea where you got the idea it is hiss? Adding hiss to a sound distorts it and is absolutely not what we hear in that video. I think it is a perfectly valid effect - but adding hiss is just wrong - but it doesn't matter, because that isn't what is being done. Most reverbs from the early springs would take off when you turned them up too much, and the output was returned to the input - a sort of reverb feedback, that Rich recognised in the 10cc song. Static is impulses - so clicks, ticks, cracks, and hiss is well, er, hiss - and hiss is not static. hiss is a range of frequencies from low to high all with equal amplitude - and infinite number of frequencies from one frequency to another, but that is not static - which is usually a single short transient spike of different amplitude - happening spread out in time.