Following on Hordijk’s fluctuation modulation, here’s a demo that I saw a while ago that’s been popping into my head, on how to program the lead sound for Vangelis’ Blade Runner theme. There’s a section on vibrato that starts around 4′23″.
I also took another look at the effects of uni and bipolar waveforms on linear FM in Robert Syrett’s Audulus Bahama oscillators – unipolar FM alters the perceived pitch (which makes sense for audible frequencies 1 since the modulation is only in an upward direction) while bipolar waveforms keep it centered. I noticed that the Moog Model 15 App has AC and DC frequency modulation inputs as well. In that case it’s simply a question of how strong the (exponential) effect is.
I was also curious to take a look at how the Model 15 App handles sync. Hard sync is as one would expect, but the weak (soft) sync is quite sublte and beautiful in the way that it gradually matches up the phase of the waveform while attempting to preserve its shape.
And finally a look at the Make Noise DPO which very much takes both linear and exponential FM into timbral texture territory. Robert Syrett has made an Audulus version of that as well.
For LFOs I guess this isn’t a problem. ↩