What is interesting though is that it is using the sound engine of "Music Synthesizer for Android" and the presets are the same as the excellent Android synthesizer "SynprezFM II". One thing that could be interesting is that it can read Sysex files of the original Synthesizer Yamaha DX 7 and this is also possible on the SynprezFM II so you should be able to create patches on Dexed and load them into SynprezFM II.
I have not tried it but am 99% sure that it should not be a problem...
In either case just happy to be able to mention SynprezFM II again, look it got mentioned four times already!
If you want to read more about the VSTi Dexed and download it for free go here:
and for downloading the free apps:
Music Synthesizer for Android