Recently bough (and sold) an Erica Black BBD. First impression was the whine – turn past a certain point and a high pitch whine is very noticable. The “character” switch is, as far as I can tell, simple levels of filtering to hide this. None really do though. Given more time though, it does grow on you. You need to simply view the longer times as a bonus (a bonus with a high pitched whine). My prompting for selling was that I have other delays that do the long-delay-time abuse better. The Synthrotek delay goes all wrong at the far end of its range but in a much better way. I’ve never really found a use for it but I enjoy it more than the whine of the Black BBD. My main issue is likely that I want long delays and a BBD is not the right tool. At shorter times the LFO did create nice, if noisy, chorus, etc. Given unlimited space and money I would have kept it. I had a lot of nice results using delay modulation to get two or even three voice loops. Voice one being my input, voice two being rhymic noise (think “snare”) and voice three at times being the whine.