I could be wrong but i think it has to do with the attack setting you have on your oscillator.. that's far from a reason.. wow, someone help me out here :P

depending on the architecture of the synth, a lot of them have very fast envelops and tend to cause a small clicking noise when notes are triggered...This is common in some Harware synths...I havent heard this in software..but then again I don't use much soft synths. I know that in some HD synths it can also happen from voice stealing, but that shouldn't be a problem in a soft synth since you can change the number of voices in almost all soft synths. I don't know if your talking about just software or both hard and soft.

imposcar has it

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1. R-Tem - Voiceless
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3. Pillow One - Ministry Of Love
4. Pulser - Point of Impact (Mike Koglin Remix)
5. Armin Van Buuren - Shivers (Christian Webber Mix)

I'm experiencing this with software synths, and the only thing I've come up with is not to trigger the cutoff that low.

Thanks for the replies so far.

This does happen with almost every synth that i have used hard or soft. Not all the time though. Im mostly concerned when im making a 16th bassline. Need the snappy attack but the filter needs to be turned way down to get the driving sound.

If you use logic im sure that you would have experienced it on the ES1, its the worst for this.