A few years ago I set out with the task of writing a fingering chart for quarter-tones for the bass clarinet. I was playing a lot of music requiring them and it was getting confusing trying to remember them all, so I started writing them down. At the same time, I was playing a lot of music that would go into the extreme altissimo range 6-9 ledger lines up!) that was also requiring memorizing a lot of new fingerings. So, I combined the two efforts and made a quarter-tone fingering chart for the whole range of the instrument, from Low C to the D-quarter-flat that sits above the 9th ledger line above the staff.