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Wednesday, June 6th 2012, 8:03pm
You may need a full reset as my Kemper did. After this the aliasing sound was totally gone and I believe it has to do with some internal gain setting than actual aliasing. In any case, a Flash memory format followed by a system restore will most likely fix your issue.Regarding the 1.0.9. FW release:
Good news: The aliasing in the distortion stomps sounds like it's gone!
Bad news: The aliasing in the high gain amp profiles is still there!
I am now more concerned than ever that when Kemper told me that the amp aliasing was different than the dist stomp aliasing, that this might be beyond a FW fix. It seems like the nature of the aliasing sound seems ever-so-slightly different than it did in 1.0.8., like there is a bit more "burst" when you hit high notes hard.
CK, will this ever be corrected in firmware?
No difference for me here. I hear these "aliasing" effects on the Wet Queen patch only with the distortion pedal (still slightly with the amp itself), I tried doing a flash format and init and reinstalling factory default rigs, still there. I'm pretty sure this update hasn't addressed this particular issue as otherwise it would have been mentioned in the release notes (and we'd hear it).
Wednesday, June 6th 2012, 8:23pm
Ah ok! Interesting. I'll stick with 1.04 I guess. I don't hear any aliasing in that firmware.You may need a full reset as my Kemper did. After this the aliasing sound was totally gone and I believe it has to do with some internal gain setting than actual aliasing. In any case, a Flash memory format followed by a system restore will most likely fix your issue.Regarding the 1.0.9. FW release:
Good news: The aliasing in the distortion stomps sounds like it's gone!
Bad news: The aliasing in the high gain amp profiles is still there!
I am now more concerned than ever that when Kemper told me that the amp aliasing was different than the dist stomp aliasing, that this might be beyond a FW fix. It seems like the nature of the aliasing sound seems ever-so-slightly different than it did in 1.0.8., like there is a bit more "burst" when you hit high notes hard.
CK, will this ever be corrected in firmware?
No difference for me here. I hear these "aliasing" effects on the Wet Queen patch only with the distortion pedal (still slightly with the amp itself), I tried doing a flash format and init and reinstalling factory default rigs, still there. I'm pretty sure this update hasn't addressed this particular issue as otherwise it would have been mentioned in the release notes (and we'd hear it).
Thursday, June 7th 2012, 11:35am
RE: Aliasing Test, Redux
V1.09 aliases in the same fashion as Demo 5, below. In other words, stomp alone sounds good, amp alone is a little gritty, and stomp+amp aliases noticeably.
I've added the following result to the SoundCloud demo suite just now :
6) WQ 109 Factory Restore
-djh
I've added the following result to the SoundCloud demo suite just now :
6) WQ 109 Factory Restore
-djh
OK, I followed MikeB's instructions "in the How to reset your Kemper to factory defaults (I solved all my problems) PLEASE READ IF YOU ARE HAVING ISSUES" to see what would happen and things got even more interesting!
First of all, going back to v1.04 and re-initializing the Factory Rigs did me a favor because I ended up with two versions of the "Wet Queen" patch, A and B. One of these two, (and I'm not sure which one at the moment, but I'm thinking "B") is the Factory Restored patch, while the other (probably "A") is probably the up-to-date Wet Queen patch that I used to create my original Aliasing Test results earlier in the thread.
If you go and revisit the demo at KPA Aliasing Test Suite, you'll see five files:
1) KPAaliasing Test - Original test using original v108 firmware and patch
2) WQ 104 Patch A - using v104 firmware and patch A (probably using my original demo WQ patch)
3) WQ 108 Patch A - using v108 firmware and patch A (again, probably using my original demo patch - this result behaves like Example #1)
4) WQ 104 Patch B - using v104 firmware and patch B (probably using the factory restored WQ patch)
5) WQ 108 Patch B - using v108 firmware and patch B (again, probably using the factory restored patch)
Now, I'm glad I retested using both patch variants because the result is this:
When using Patch A, the stomp box aliasing at :14 is there in spades. When using Patch B, it's minimal (phew!) - Independent Of Firmware Version. So, the stomp aliasing appears to be a patch-related issue.
When using the V108 firmware, the "grit" that you can hear in the Amp section around :26 is there. But in V104, it's not. So, the grit appears to be a firmware thing.
The original "KPAAliasingTest" demo was the worst case, effectively the same as 3) "WQ 108 Patch A" having both aliasing -and- grit present. That doesn't mean there's -no- aliasing when things are working right, you can still hear it but it's definitely tolerable!
-djh
Thursday, June 7th 2012, 11:41am
RE: RE: Aliasing Test, Redux
I can definitely hear this in your soundsamples.V1.09 aliases in the same fashion as Demo 5, below. In other words, stomp alone sounds good, amp alone is a little gritty, and stomp+amp aliases noticeably.
Has Kemper acknowledged the problem?
"Quote me... I dare ya!"
USA Custom Guitars Strats -> KPA -> Alesis M1 Active MKII
www.myspace.com/schneidas
great guitar parts:
www.usacustomguitars.com
USA Custom Guitars Strats -> KPA -> Alesis M1 Active MKII
www.myspace.com/schneidas
great guitar parts:
www.usacustomguitars.com
Thursday, June 7th 2012, 1:26pm
In my opinion the aliasing even has become worse with the new FW!
Bad news: The aliasing in the high gain amp profiles is still there!
I am now more concerned than ever that when Kemper told me that the amp aliasing was different than the dist stomp aliasing, that this might be beyond a FW fix. It seems like the nature of the aliasing sound seems ever-so-slightly different than it did in 1.0.8., like there is a bit more "burst" when you hit high notes hard.
CK, will this ever be corrected in firmware?
"burst" describes the strange attack quite well. You can hear that distorted white noise up-sweep very clearly with gain maxed, just hit a high note hard. Some notes sound worse than others, here on most hi gain profiles the C# on the B string 14th fret sounds totally destroyed. And I mean TOTALLY DESTROYED! like if there´s a Devi Ever lo-fi Fuzz pedal engaged...lol...
Thursday, June 7th 2012, 1:37pm
RE: RE: RE: Aliasing Test, Redux
I can definitely hear this in your soundsamples.V1.09 aliases in the same fashion as Demo 5, below. In other words, stomp alone sounds good, amp alone is a little gritty, and stomp+amp aliases noticeably.
Has Kemper acknowledged the problem?
Schneidas,
What I know is: They're aware of the problem, they tried a quick fix, and apparently decided against it.
[Begin Conjecture]
What I suspect is: Sometime after v1.04, Kemper decided that they wanted to free up some DSP for future improvements, and took the stomp block out of the oversampling section as a performance optimization. While this is a good idea for linear effects, it's unsatisfactory with distortion pedals hence the problem. My guess is that they've been experimenting with making stomp oversampling conditional on whether there's enough DSP available for the task, which may not be the case when running both the MetalDS pedal and amp in oversampled mode under the current feature set.
If that's the case, the solutions would be to try to either a) Optimize the code, b) Drop the distortion pedals, c) Roll back to a v1.04-era functionality or d) Just live with it. And that's probably why Kemper is being rather quiet. Unless the box is expandable in some way, it's the kind of thing that might lead to a faster DSP in the next-gen (rack?) KPA.
[End Conjecture]
I realize I'm sticking my neck out with that stuff I just said, and at any moment CK could pop up and call me a horse's ass. But I'm willing to risk that, because any new piece of information helps increase our understanding of The Mighty Lunchbox.-djh
Thursday, June 7th 2012, 1:59pm
If this is the scenario, I´d vote for "all DSP power for amps"!!!!
The most important part of the KPA for me is it´s ability to deliver countless hi quality amp sounds for instant studio use.
I don´t care for it´s FX-department at all. I have lots of stomp boxes that all sound better anyway.
+1
Anyway I hope that this is not the case at all..I just do not want to see a KPA std then KPA ultra ,then II because of lack of power ;-)
Thursday, June 7th 2012, 4:22pm
I agree!If this is the scenario, I´d vote for "all DSP power for amps"!!!!
The most important part of the KPA for me is it´s ability to deliver countless hi quality amp sounds for instant studio use.
I don´t care for it´s FX-department at all. I have lots of stomp boxes that all sound better anyway.
It might not be going away until the KPA II.
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