I've recently started to play the double bass after having played a fretless for years. There's a thing I've always done on fretless that I can't do on the double bass, but I'm sure I've heard people carrying it off in recordings, so I'm interested as to whether anyone has any suggestions (or even knows what I'm on about...)
When playing a walking baseline with a triplet feel on fretless, I will sometimes play octave-fifth-root in a quick triplet sweep (e.g. D on the G string, A on the D string, D on the A string), with a rhythm like ba-ba-ba dum dum dum dum etc. The move is a little bit like the second to fourth notes of the baseline of 'Money' by Pink Floyd, only with the three descending notes played as triplets within a one note per beat line.
Anyway, on a fretless I can finger this 4-3-1 and hold that more or less as a chord while sweeping one right hand finger down across the strings. On a double bass I can't do the left hand in the same way at all, but I hear people pulling something very like this off on various jazz recordings. Do I just need to practice more, or does anyone have any cunning tips as to how to achieve this effect?