Grabbed Patch Base when it first became available for use with my Casio CZ collection. Simple to use, intuitive interface. Since then, additional IAPs have been released for other synths I have such as the ESQ-1, JD-Xi and Minilogue. They all function flawlessly, and it makes Patch Base one of the most useful tools in my box. The world really opens up when you don't have to deal with menu-diving. Advice: if you get Patch Base and are interested in even just two synth IAPs, consider the full-access instead. As the app has evolved, I realized it would be easy for me to spend more on individual synths than just full support for all that's available now, and what's possibly to come. One of the beauties of this app is that it's adding broad support for old and new synths, so keep that in mind. 5 stars, highly recommended.