Just hook up a MIDI interface and control any MIDI enabled synth or keyboard. In addition to the wheel interface this app also features a pitch ribbon / wheel combination as it could be found on some vintage synths.
This app comes in handy when you are using one the two new Hammond organ keyboards SK1 and SK2, which also feature great synth sounds. But for some reason the designers have forgotten the performance controls! ModWheels help you using the full potential of those keyboards. ModWheels also works great for keyboarders who can’t get a hang of Roland’s pitch bend / mod controllers.
ModWheels also supports MIDI over WIFI. On OS X that works out of the box. On a Windows PC you need to download a program called rtpMIDI. Then follow the instruction on:
http://www.tobias-erichsen.de/software/rtpmidi/rtpmidi-tutorial.html
See screenshots here
ModWheels has been rated „Killer App“ by the testers of Apps4iDevices
“I am currently on tour in Australia with Spectra recording artist Nadia Ackerman and using mod wheels on stage as part of a complex set up driving Kontakt 5, M-Tron pro and NI Pro 53. The ribbon controller in particular is giving me a level of expressiveness I could not achieve before.“