Hello guys,
I've noticed that the envelopes of Zebra2 behave unexpected in a few of my projects. They create a sudden drop off in volume or filter frequency at the end of long midi notes when using long attack and release times.
I've uploaded an audio file of a short sequence in which the issue is very prominent here:
https://sndup.net/2hnd
I've also attached a screenshot of my settings inside Zebra 2.
The midi notes are just simple 3-voiced chords that don't "touch" each other, they have 1/16th note value space between them.
I initially suspected the midimapper causing the issue but it remains after disabling them. LFO's are set to "free" and should not make sudden changes after midi notes end anyways.
So in my personal search for the cause I've identified the envelopes to be the problem.
Another thing I've noticed is that the last (fourth) chord in that progression (which is relatively short and has a lot more space to the next cluster of midi notes) does NOT create that "thump" sound. So I'm suspecting that the quick start of a new set of midi notes triggers the envelopes to behave this way.
I could theoretically shorten my midi notes to circumvent that behaviour but I'm actually interested in the exact cause of this issue to understand the properties of the envelopes better.
Zebra2 Envelopes behaving unexpected - Creating "thumps"
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- u-he
- 30213 posts since 8 Aug, 2002 from Berlin
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- KVRist
- Topic Starter
- 37 posts since 6 Jun, 2013 from Germany
Thanks for the reply Urs.
Yes, that fixes the problem - but that also means that the envelope gets triggered "globally" as soon as it is fed new midi notes right? Meaning the envelope doesn't act like a polyphonic envelope based upon their respective voice but as a monophonic envelope. It also seems that this behaviour is only valid for the global effects VCF5 and VCF6, envelopes controlling VCF1-4 in the routing grid behave like polyphonic envelopes letting the respective notes fade out smoothely.
Are my observations correct? The manual seems a bit withdrawn regarding this topic.
Yes, that fixes the problem - but that also means that the envelope gets triggered "globally" as soon as it is fed new midi notes right? Meaning the envelope doesn't act like a polyphonic envelope based upon their respective voice but as a monophonic envelope. It also seems that this behaviour is only valid for the global effects VCF5 and VCF6, envelopes controlling VCF1-4 in the routing grid behave like polyphonic envelopes letting the respective notes fade out smoothely.
Are my observations correct? The manual seems a bit withdrawn regarding this topic.
Squisch
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- u-he
- 30213 posts since 8 Aug, 2002 from Berlin
The envelopes are polyphonic, but the effects are not. In Zebra, all generators and almost all modulators are part of "voices", which means they're polyphonic. Those voices are summed to a stereo mix and fed into the effects section, which then of course isn't polyphonic.
When polyphonic modulators are assigned to non-polyphonic parts such as effects, it's always the voice triggered by the most recently played note that takes over the modulation duty. Hence, indeed, when a new note is pressed, the current modulation stops and a new envelope whatsoever takes over.
When polyphonic modulators are assigned to non-polyphonic parts such as effects, it's always the voice triggered by the most recently played note that takes over the modulation duty. Hence, indeed, when a new note is pressed, the current modulation stops and a new envelope whatsoever takes over.