This App is meant to find and try individual patches from various collections of Yamaha DX7 Sysex Patches available online. This has been Tested with Korg Volca FM, NI FM8 as well as Dexed VST and should likey work with any hardware that accepts yamaha DX7 Patches. Some Pataches will not work on the Volca due to reasons unknown. Best way to use this app it to do a search or list patches and then use random button to find a tone you like. Unlike Traditional DX7 Banks (32 patches each), Here each patch is separate.)