I think this is my first SB5000 fretless:
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And this is a SB4000 fretless that I bought from LarryElwood that he converted himself:
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Here's a clip I made just now of my current SB5001 fretless with DR Sunbeams:
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First half of the last clip is both pickups full. Half way through I rolled the volume back on the neck pickup a little and favored the bridge.
Note that I was sitting about 16 inches away from a computer monitor and no buzz with the J99A single coils.
macribas, I added the last line in that clip just for you. It's a bass line from one of my fave Austin bands from the 90's.
The first two tracks in particular are beautiful with great tone and feeling. I've only played fretless basses in stores but this year I will own one. It's such a beautiful unique sound that nothing else comes close to. Thanks for posting your tracks.

