There sounds like there's some resonance going on and a notch filter or something, but from my understanding, an all-pass filter doesn't have resonance.
Cool effect though!
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What is the All pass 3-pole filter actually doing?
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- KVRist
- Topic Starter
- 32 posts since 1 Aug, 2019
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- KVRist
- Topic Starter
- 32 posts since 1 Aug, 2019
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- u-he
- 28113 posts since 8 Aug, 2002 from Berlin
There's a 3-pole Allpass in Zebra?
The AP3 in XMF... is an all pass only when not driven too hard, and when not using resonance.
Like all of the XMF types, it's created by mixing the outputs of a 4-pole lowpass filter. This works well to some degree as long as levels are low. The filter response however deviates quickly from the ideal response because of the non-linear behaviour of the individual stages. Then the math doesn't add up anymore, and that's particularly obvious in the AP modes.
The AP3 in XMF... is an all pass only when not driven too hard, and when not using resonance.
Like all of the XMF types, it's created by mixing the outputs of a 4-pole lowpass filter. This works well to some degree as long as levels are low. The filter response however deviates quickly from the ideal response because of the non-linear behaviour of the individual stages. Then the math doesn't add up anymore, and that's particularly obvious in the AP modes.
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- KVRist
- Topic Starter
- 32 posts since 1 Aug, 2019
...lol you would know. Unless I'm totally misunderstanding what this means...which is totally possible.
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- KVRist
- Topic Starter
- 32 posts since 1 Aug, 2019
Oh! Ok so there is a low pass filter at some point in the chain?Urs wrote: ↑Sun Dec 03, 2023 10:56 am There's a 3-pole Allpass in Zebra?
The AP3 in XMF... is an all pass only when not driven too hard, and when not using resonance.
Like all of the XMF types, it's created by mixing the outputs of a 4-pole lowpass filter. This works well to some degree as long as levels are low. The filter response however deviates quickly from the ideal response because of the non-linear behaviour of the individual stages. Then the math doesn't add up anymore, and that's particularly obvious in the AP modes.
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- u-he
- 28113 posts since 8 Aug, 2002 from Berlin
Kind of.
All XMF responses are based on the math behind the Oberheim Xpander and Matrix 12 filters. Technically those have a simple 4-pole lowpass filter. But instead of using just the output of the last stage, they tap into each single stage and then add/subrtract them in ways that are meaningful. So if you take the 4th pole lowpass and subtract the 2nd pole lowpass, you'd get a 4 pole bandpass and so on.
Like in the hardware, these are all just approximations that work only so and so well. I'm not even sure if we got them exactly right, as the XMF probably has stronger nonlinearities than the original hardware, and thus it may deviate at even lower levels.
All XMF responses are based on the math behind the Oberheim Xpander and Matrix 12 filters. Technically those have a simple 4-pole lowpass filter. But instead of using just the output of the last stage, they tap into each single stage and then add/subrtract them in ways that are meaningful. So if you take the 4th pole lowpass and subtract the 2nd pole lowpass, you'd get a 4 pole bandpass and so on.
Like in the hardware, these are all just approximations that work only so and so well. I'm not even sure if we got them exactly right, as the XMF probably has stronger nonlinearities than the original hardware, and thus it may deviate at even lower levels.
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- KVRist
- 350 posts since 24 Oct, 2007 from the bavarian badlands
+1 !!
XMF still is one of the best software filters out there.
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- u-he
- 28113 posts since 8 Aug, 2002 from Berlin
We plan to merge all filters into a single filter module. All will get FilterFM and all character types will have an abundance of responses.
