The Poly-Ana VST by Admiral Quality is an "Analog Model Polyphonic Synthesizer" which first released in 2007 to critical acclaim. From there, it's improved to meet user critique. It produces classic analog sounds "inside the box," and EZB has does the amazing work of bringing this plugin to life with a real iPad UI. The controller has hundreds of controls to access all aspects of this plugin directly.
You'll need to check the Q&A entry to get the mapping file and instructions for install.
Here is the layout for the AdmiralQuality Poly-Ana.
The layout will work in combination with the default midi cc map of Poly-Ana that has been attached here.
1. Make a midi track that gets input from your ipad on midi channel 1.
2. Point that midi track to Poly-Ana channel 1.
3. Make a midi track that gets input from your ipad on midi channel 2.
4. Point that midi track to Poly-Ana channel 2(!!!)
Link to the default midi cc mapping file (do not rename)
Add the default midi CC mapping file to the following location:
Windows 64-bit and 32-bit
C:\Program Files\(x86)\Admiral Quality\Poly-Ana
~/Library/Application Support/Admiral Quality/Poly-Ana
Older version is here