I am still at the "Oscillator" section of Jim Aikin's great Power Tools for Synthesizer Programming book and in it the osc sync function is described very well. I have never programmed an osc synch patch before and so thought I'd have a go for this blog, tweaking until I found something nice.
This patch uses two sine waves, the first of which is used only to sync oscillator two as the level of oscillator one is set to 0%. I have detuned oscillator two by a couple of octaves and the output is a rather pleasant buzzing sound not dissimilar to a saw wave. I added unison to fatten the sound a little and then added a couple of low pass filters in parallel. So far, so good.
Then I noticed a rather odd thing when I was previewing the patch. If I held a note and then struck another note twice in quick succession the sound lost its higher frequencies. The speed at which I struck the second and third notes was crucial to whether or not the higher frequencies were filtered out or not. Is this a bug in the software or a feature of VA synths when using osc sync? Perhaps one of you clever bunch can elighten me?
And here is a link to an example of the "bug" in action! (aiff format sound file)