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Here you can find 2 styles that you can download for free. The styles are only bass and drums. They can be downloaded along with 2 standards that go well with these styles.
Here you can find 2 Soundfont files that you can download for free. They all contain an Upright Bass and Brush Drums and a piano.
Both contain a great sounding piano.
N° 1 has bass and drums without a lot of velocity layers. Good sounds, though.
N°2 has more velocity layers. The bass is from samples of a sophisticated upright bass. Used to be sold by a rather shady company called Sonart, but that doesn't exist anymore.
The drums are more velocity layered also. Makes for a different sound and more variation.