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SynprezFM 2 is also a Yamaha DX7 emulator, that can render with accuracy the sysex files you upload into an external storage directory setup by menu, in order to extend the experiment.
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Maybe it is a bit of an overkill to get even more ready made sounds as SynPrezFM comes with 1024 presets... but anyhow if that is not enough go here:
http://bobbyblues.recup.ch/yamaha_dx7/dx7_patches.html
Play Store link:
SynPrezFM II