I have a great admiration for anyone who can successfully play a fretless stringed instrument; Violin, Viola, Cello, Double Bass, etc...

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How they manage to quickly locate the desired note on the fretless fingerboard is beyond me...

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I tried to master my Violin a few years ago, but after a lifetime of playing fretted instruments, I finally gave up, and fitted frets to the instrument, without much success...

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(Some early music violin-type instruments are fitted with frets, and bowed "under-hand" ).
My MIDI keyboards/synthesizers contain some fine examples of acoustic Bass and electric Bass instruments which are quite easy to play, with velocity applied...

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Cheers all..
....carry on strumming...

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F....slapping my Bass... 8-)...!
Heh, your respect for them quickly fades when you have to accompany a string orchestra in a brasswind. It is quite difficult to play in tune with strings when they never play the same note with the same pitch...
As for me, I play the tuba, baritone horn, and trombone. With the Tuba and Baritone I play chamber and classical as well as 19th and 20th century wind ensemble music (Dello Joio, Sousa, ect.). With the trombone, it's all jazz.
As for what I listen to... classic rock.