Ah I see what you mean now. This has nothing to do with the parameter interpolation, but with the accuracy of the frequency conversion in the filter. I had set it to a lower accuracy for testing purposes some time ago, but forgot to switch it back. This causes a little noise when changing the cutoff frequency on high notes. Thanks for noticing, this will be fixed in the next update.Summa wrote:Buffer Size ist 512 Samples, Soundcard Juli@ at 44.1khz and the interpolation works fine for my other softsynths. But I might have mistaken zipper noise for missing interpolation, since it sounded somewhat different on 96khz...
High levels of resonance means the signal is amplified hundreds of times. The filter has non-linear saturation functions built in, which will add harmonic distortion when the signal levels are high. The point of this is that it creates a full and analog-like warm filtering sound. However, it has the downside that it is harder to design, it needs more processing power and it can add some aliasing at higher frequencies.Summa wrote:Sorry to say that, but the aliasing is getting slightly better at 96khz, but it's still tweeting at high resonance. Other than that I'm getting random clicks at 96khz, even so the processor load isn't getting higher than 6%...
It's very easy to create a simple 24dB lowpass filter that is fully alias free. These are used on lots of VSTs, but these simply sound digital and cold. That's why I chose to design my own. And I think this was a good choice, since many people have already told me that they like Sylenth's filters better than most other VSTs.
So yes, there is a bit of high frequency aliasing when you use high resonance or high drive levels. But since using such high levels of resonance or drive on very high notes does not make much sense anyway (they are usually used on bass-sounds), I don't think this is much of a problem. Besides that, an oversampling option will help reduce the aliasing artifacts anyway.
As for the clicks you mentioned, I expect these are caused because of buffer underruns? If you use a higher sampling rate you should also scale the buffersize accordingly. Clicks can also be caused if the host application (or the audio processing thread in the host) is not running on high priority. But either way I don't see how this could be caused by Sylenth.
) My congratulations for creating such a wonderful synth.
