Please bear with me:
What do all Bass players have to do on a regular basis, tune the instrument.
Given the (relative) simplicity of tuning devices, why it incorporate in in the bas it self, you guys are the perfect people as my proposal is you use illuminated first markers to display the pitch. a central one (green ) indicates when its correct and one up shows its flat, one down shows its sharp.
When not in use it revers to standard markers (illumined or not, guess that personal choice). As a unique option I think it would be a great offering and of course great for publicity etc.
What do you think?
Kerry