fluffy_little_something wrote:ToguAudioLine wrote:It took me some time to find the "issue". It also happen when you use a rectangle LFO and modulate the filter 1.
After some research i found out that this is a normal behaviour under these conditions:
- Filter in serial mode.
- Play a sound > 1000Hz (example) with ritch harmonics (saw, pulse...)
- Filter 1 with rectangle LFO that modulates the cutoff and goes down to 0 Hz or below 1000Hz (huge range).
- Filter 2 with a cutoff a bit higher 1000Hz that filters out some harmonics of the sound. Or choose 200Hz to filter out the whole sound to get an extreme effect where you only hear the pops.
Now you can hear that low frequency pop sounds at the transition points. Especially when the filter closes (from 20000Hz to 0Hz for example). This is because the filter needs some time to make the frequency jump. What you hear is some type of fast filter sweep from 20000Hz to 0Hz. This is totally natural.
The solution is easy. Just switch the filters and filter the high frequncy with the first one and do the filter modulations (evelope, rect LFO) with the second filter.
Not sure I understand your explanation. But it results from the dual filter architecture, right?
In serial mode there are three cutoff knobs involved since one can't just bypass either filter. Maybe adding a Bypass option in the filter mode drop-down menu would help. Oops, forget it, that's what the parallel mode is for...
Just loaded that patch again and tested stuff.
I still think it has to do with the envelopes or voice stealing as I had originally suspected. From my patch, when I reduce the filter env attack to zero, oddly the clicks go away. With other synths it is the other way round
When the filter env attack is slower than the amp env attack, many synths make the typical synth brass bump, but it seems to be something different.
And as I said earlier, it goes away when I add more voices. With two voices it is still there, but more rarely. With 4 voices I no longer hear the clicks.
Thanks for the additional information
The synth does some fades when he steals a voice, but this only affects the amp.
You can only hear it when the synth re-uses a voice, because it has to make that frequency jump (go down to the attack start point of the filter ADSR). A fresh note (especially when it has filter TRIG enabled) starts with fresh initialized values and don't have to make that jump. It just starts at the start frequency and does not have to jump to the attack start frequency. It also does not have older values of the higher frequency in his history. Maybe all values are zero.
IIR filters remember old values for some time and the filter needs it's time until he forgets the older values and is completely closed.