Regarding sound:
This video is interesting and quite well done. Identifying tone A as Ash and tone B as Acrylic kind of screws up the blindness...
The only thing important to establish in the video is: "Are the two tones alike or are they different?" The polling should have been done differently.
I found myself hearing a difference but thinking OK Im convinced there will be a difference so my brain is forcing me to hear a difference.
So I did something different, I imported MP3 of tone A and of tone B and ran a graphic analysis to see if a difference would present itself visually (OK MP3 is not the best but both tones are the same resolution so...) so what do you think?
Note:One image shows A & B together and includes all three strums including the following sustain and decay. The others are close up of strum 3.