one thing i have noticed with synthedit in ableton live, is by putting some sort of audio through into the plug in the oscillators will run. then adding a seperate MIDI track with a VSTi, you can route the MIDI in using the MIDI from section in the INPUT/OUTPUT section.
(this is how to route the midi from the Sanford LFO in Ableton)
i have however not worked out how to get any of the VSTi parameters to learn from the MIDI generated. so I can record the CC output, but can't assign it to a parameter .
hope that all makes sense:)
edward
i havent quite worked out the most efficient way of adding an audio through, so i just insert something like the Flanger effect
