Don't get hung up on being slidey - work on accurate intonation. Scales work well, because you (should) know what it should sound like. Developing your ear is critical.
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Joiner Basses (P-J & Fretless)
Ben Lindsey 'Stang Bass
Eden Club #156 (WT800C/210XLT/210XST)
Warrior Club #14 ('97 with updates pups/pre '09)
Praise and Worship Band Bassists #77