Roland released a line of 12 expansion boards over the course of a few years starting in 2000. Many of their synthesizers have expansion slots and they are an easy way to increase a synthesizer's capabilities with a specific type of sound set.
The Roland SRX expansion boards are compatible with the XV and Fantom series of synthesizers.
The G-70, MC-909, Juno-G, and V-Studio 700 each support 1 expansion board.
The Fantom FA-76, XV-88, XV-3080, RD-700, Juno Stage 2, VR-760, XV-2020, XV-5050 and Sonic Cell each support 2 expansion boards.
The XV-5080, Fantom-S, and Fantom-X each have 4 SRX expansion board slots.
The Fantom XR has 6 SRX expansion slots.
The Integra-7 comes with all twelve expansion boards preloaded in its operating system, but it can't use them all at once, so they have to be installed in "virtual expansion slots".
SRX-06 Complete Orchestra (Contains all waveforms from SR-JV80-02 Orchestral, SR-JV80-13 Vocal, SR-JV80-16 Orchestral II, and selected waveforms from SR-JV80-07 Super Sound Set) (Manual)
SRX-07 Ultimate Keys (Contains all waveforms from SR-JV80-04 Vintage Synth, SR-JV80-08 Keyboards of the '60's and '70's, SR-JV80-10 Bass and Drums, and selected waveforms from SR-JV80-09 Session and SR-JV80-03 Piano) (Manual)
SRX-08 Platinum Trax (Contains waveforms from SR-JV80-11 Techno, SR-JV80-12 Hip Hop, SR-JV80-15 Special FX, and SR-JV80-19 House) (Manual)
SRX-09 World Collection (Contains waveforms from SR-JV80-05 World, SR-JV80-14 Asia, SR-JV80-17 Country, SR-JV80-18 Latin) (Manual)