here are two other topics about synesthesia. Actually Bruno was the inspiration for my own “mixing senses” LD 
https://community.ld4all.com/t/synaesthesia/15682
https://community.ld4all.com/t/tasting-colours-synesthesia/22875
I won’t recommend tasting colors. 
It tasted horrible 
@emozombie: I had never heard of that one! wow, how was that for you when you had to learn the alphabet when you were young? Did it make it easier for you or harder?
Lol about the alphabet soup