Modulating spectral parameters would be awesome, but I don't know of any synth that allows for modulation of complex graphical interface parameters such as the extremely high number of possible spectral selection points in Iris. Even modulating the points of custom LFO curves or multi-step envelopes is not possible in most (I think all, with some simplified exceptions) synths. I have been waiting for Flexion for years which was said to make LFO-point modulation possible but it seems abandoned...
Not sure about the presets, I usually just drop a sample in there and start with the spectral selection.Does anyone know if the add-on libraries are supposed to come with patches or are they just samples? I installed the toys and objects add ons and there are only samples.