| I usually like to base a simple short solo off the main bassline I'm normally playing for the part, rather than come up with something perpendicular to it... Staying true to the chords, and continuing to play the same bass role as in the rest of the song is important, otherwise it sounds tacked on or even derails the momentum.
For difference sake I'll either transpose it to another octave (if feasible), or I'll just go in the opposite direction of it (i.e., if the bass line normally descends, I'll ascend instead), maybe putting ghost notes in to accent the rhythm, and maybe a little fill at the end of each phrase, while not forgetting to keep the pulse going.
If there's a section of the verse where the chords build tension prior to resolving into something else, I might do something like dig in harder and play steady eighth notes that start at the roots of the chords and then at the last chord move to the note that makes that chord suspenseful...
There are tons of ways to generate a decent solo, most of which I probably suck at myself... You just have to do whatever's in your ability that would sound most appropriate for the tune; make it about the song rather than try and impress the listener with your dexterity. A harmonically satisfying but simple solo that strengthens the tune usually sounds a lot better than a flashy horizontal solo that disrupts the dynamics and mood of the song.
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Hollowbody Bass Club #121, Hondo Club #002, Official Short Scale Bass Club #018, Short-Scale Six-String Bass Club #001, Epiphone Club #010, can't recall what other clubs I'm a member of here...
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