The Alembic Spoiler is an electric bass used by Prince, Brownmark and Levi Seacer Jr. Brownmark first used one on the Purple Rain tour and it became his main bass. This bass was white with a custom flower design. This bass was fitted with some kind of synth pickup to connect with a Roland bass synthesizer, possibly a Roland GR-77B.
Levi Seacer Jr then used a black Spoiler on the Sign O The Times tour - this might be the same bass refinished. This bass remains in the collection at Paisley Park.