Not a Blackwing video per say, but since so many reviewers only faulting of the 4BW is the engine sound, I invite you to listen to some of what I might agree are some very beautiful sounding engines. As someone who used to daily an FType, I'll let you judge for yourself how much closer the 4BW's twin turbo LF4 V6 sounds to the big cats supercharged V8 than an M3/4 I6.
I think that's the issue the LF4 has, in that it sounds more like a V8 than either an I6 or V6, but clearly is not a V8, that it straddles the segments much like the cars it powers do.
And for the record, I prefer the sound of the Supercharged LT4 in the CT5, ZL1, and Zo6 than the excessively whiney Hellcat Hemis.