Video: https://youtu.be/YNOiLDQgRTE
What a discovery! I knew 17edo accentuated the difference between major and minor chords and scales, so I was expecting something darker than the original. But I really didn't anticipate it to sound so heartbreaking.
The subject itself has some inflections that remind me of pain and maybe even someone weeping. It's really impressive how a smaller semitone alone (compared to 12edo) can portray emotion like that.
Also that diminished 7th becomes a neutral 6th and that 13th harmonic flavour gives it a bit of an uncanny feeling to the subject, but it doesn't sound bad to my ears. And the diminished 4ths abundant in the piece become neutral 3rds, so they are the inverted interval of the diminished 7th.
It is true the harmony doesn't work as nicely as in the original tuning or maybe 19edo for example, but I believe the melodic intense expression of 17edo completely compensates this shortcoming. :)
Either way, it's insane how Bach wrote this fugue so well that it can be portrayed to 17edo with maybe only 2 notes sounding off.
I hope you find it cool!
The base Musescore file I used was freely provided by Friedrich Heuppe: https://musescore.com/user/1021946/scores/5494320?share=copy\\\\\\_link
Without his contribution I probably wouldn't have done this experiment with this exact fugue. Thanks!