I can't remember ever putting a capo on a bass.
I tried a capo just yesterday because the BL told me to be ready to play the Peter Gunn theme on Saturday.
The original TV theme is in F and so is Duane Eddy’s cover version. The bass line is: F F G F Ab F Bb A on the original and Duane’s version is the same but it ends with F Bb Ab.
The Blues Brothers and most of the YT video tutorials play it a half step down: E E F# E G E A Ab
F not being an open string, it’s clumsy to play it in that key unless you play it up an octave which is probably why so many people play it in E. So I tried tuning the E string up to F and also tried a capo on the first fret, both worked. When I checked back with the BL he confirmed we’ll do it in E. So I can leave the capo home and skip retuning for just one song.