The SX-900 is pre-loaded with 4 expansion packs
African
Europe
Latin America
Oriental

Yamaha has now made many expansion packs available for free including Fiesta Caliente 2, you can listen to samples and a list of styles, voices and pads for this pack, and I believe Manny was involved with assembly.

I currently have 11 expansion packs loaded, and the limit is 1GB, and I think I'm close to that limit.
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Larry "Hawk"

♫ 🎹🎹 ♫ SX-900