of my favorite sounds were the main synth line on It's My Life, the shriek sound similar to an elephant on Such A Shame, and the lead synth on It's You. What keyboards/technique did you use to get those sounds?
Not entirely sure what the main synth line on It's My Life is, but the main organ / pad sound on it was probably Tim, on an Oberheim OBMx, but most the others were me on a Roland Jupiter 8, except one we called Tugboat (the 2 note deep blown sound on the verses, that was Tim again on OBMx)
The Elephant was using one oscillator that rose and dropped in pitch, while being cross modulated by another oscillator which makes the pitches of oscillator one sound as harmonic distortion on the sound of oscillator 2. That's basically it, anyway.
Again, I'm not really sure what you refer to as the "lead synth" on It's You. The organ / pad synth from the bridge is a similar OBMx combination to It's My Life I think, from TIm. The 5ths lead synth after the first chorus and under verse 2 is as derivative of one of the JP8 sounds I used to use distorted for the guitar parts, a kind of bell sound but without the distortion. I think it features on The Last Time too, or another derivative of it. The solo was done on a similar sound to the main chorus line in Such A Shame, more cross modulating oscillators but without the pitch changing so drastically, just used to give a distortion to a more controlled pitched sound. Underneath that is another of the bell like sounds I used for guitar parts, this time distorted through a guitar amp and then sent to a PA rig and recorded in the room like that.