The latest update to Patch Base (now in version 2.4) adds a fully-featured program/patch editor for the Roland JD-Xi, bringing the number of supported synths in Patch Base to 30. Here's the story in their own words...
This new editor is the most complex yet in the Patch Base collection, including support for the JD-Xi's 2 digital synths, analog monosynth, sample-based drum machine, and on-board effects and mixing.
The hundreds of parameters that the JD-Xi uses are all here, allowing for a sound design experience far beyond what's available using the JD-Xi's built-in controls (unless you enjoy hours of menu diving!). All of this control is achieved via a 5-page layout for the editor. In addition to the individual controls, many aspects of your patches can be copied, pasted, and randomized. And as always, Patch Base allows you to store and organize these sounds on your iPad for later use, backup, and sharing.
Pricing and Availability:
See website. For the next several days, the In-App Purchase for the JD-Xi editor is 50% off.