UPDATE: Free App to control CV/Gate Synths via Phones Jack from the iPad (or iPhone): Trigger Box.
What’s New in Version 1.1
– Added the option to have two individual sequencers running on each stereo channel
– Added an in app store for additional sequencers
– Added a new step sequencer to the in app store
– Small user interface and timing improvements
and something similar – released earlier:
BruteLFO: this app generates an LFO on the iPhone for an analog synth (in this case a Minibrute) via phones jack ->iTunes