Kemper Player spontaneous / random parameter change

carloswalter · November 8, 2024 at 7:29 PM

Has anyone experienced their Kemper Player changing parameters (slightly) on its own while playing? All of a sudden the slot button goes from white to yellow. I don’t know which parameter has changed. Could this be thermal or mechanical vibration related? Note that this only happens when I’m playing through it, haven’t seen it happen when idle. Also, I think it only happens when a Bluetooth player is connected to it (e.g. my phone), not sure yet. Hope it’s not haunted.

AppleTreeChen · November 9, 2024 at 5:22 AM

I find a problem with Player（kpp） - Issues - Get help solving your problem - Kemper Profiler Forum (kemper-amps.com)

This has been an issue for a long time and I have contacted kemper tech more than once about it, initially they said they had noticed this issue as well, later they said it was normal.
Of course, I don't quite understand the official explanation as to why it changes state without any action.

timo · November 9, 2024 at 7:58 AM Official Post

Turn the Profiler off and move all knobs once. Does this help?

JCW308 · November 9, 2024 at 1:51 PM

I reported this too and was told it was impossible, that I was moving things with my mouse.

AppleTreeChen · November 9, 2024 at 2:07 PM

Quote from JCW308

I reported this too and was told it was impossible, that I was moving things with my mouse.

Turn on the power, there is no touch, no operation, no device access ...... After some time, the bank button turns yellow. I have done numerous tests, a psychic thing

carloswalter · November 9, 2024 at 3:41 PM

Quote from timo

Turn the Profiler off and move all knobs once. Does this help?

Yes, I tried that and doesn’t help. Thanks for the suggestion, though, that is a good idea.

carloswalter · November 9, 2024 at 5:02 PM

OK, so I did some more experiments with this issue today.

When I play through the KPP without Bluetooth engaged, there is no problem, there is no random parameter change, rock solid.
Shortly after I connect my phone to the KPP via Bluetooth, start playing music, and play guitar at the same time, the slot LED goes from white to yellow and I see some sort of parameter change on the LED strip on the KPP, I don’t know which parameter is changing.

So this could be some sort of RF interference when Bluetooth is active that is causing the unwanted parameter change. Maybe lack of proper shielding somewhere inside the board on some component.

I’ll see if I can pinpoint exactly which parameter is changing using Rig Manager.

Can someone try and reproduce this issue on their KPP?

TobiasBales · November 9, 2024 at 8:11 PM

Quote from carloswalter

OK, so I did some more experiments with this issue today.
When I play through the KPP without Bluetooth engaged, there is no problem, there is no random parameter change, rock solid.
Shortly after I connect my phone to the KPP via Bluetooth, start playing music, and play guitar at the same time, the slot LED goes from white to yellow and I see some sort of parameter change on the LED strip on the KPP, I don’t know which parameter is changing.
So this could be some sort of RF interference when Bluetooth is active that is causing the unwanted parameter change. Maybe lack of proper shielding somewhere inside the board on some component.
I’ll see if I can pinpoint exactly which parameter is changing using Rig Manager.
Can someone try and reproduce this issue on their KPP?

Doe the player support midi via Bluetooth? That could, if so, also be a reason

carloswalter · November 9, 2024 at 8:49 PM

Quote from TobiasBales

Doe the player support midi via Bluetooth? That could, if so, also be a reason

The Kemper Player only supports MIDI via USB, not via Bluetooth. The Bluetooth connection is just for audio playback.

timo · November 9, 2024 at 10:09 PM Official Post

Can you store that changed rig into a second slot, then create a backup and send it to support? So that it is possible to inspect any changes?

carloswalter · November 10, 2024 at 12:57 AM

Quote from timo

Can you store that changed rig into a second slot, then create a backup and send it to support? So that it is possible to inspect any changes?

I’ll try to reproduce again and capture in a different slot.

kpahuitsing · November 15, 2024 at 8:45 PM Official Post

Hi carloswalter / AppleTreeChen / JCW308 ,

In public beta OS 12.0.1, we've implemented a fix which should solve this problem. If you want, you can test out that version and check if it solves your problems.

AppleTreeChen · November 16, 2024 at 11:19 AM

Thanks @kpahuitsing

Just have upgraded to public beta OS 12.0.1, it will take a while to see

AppleTreeChen · November 16, 2024 at 12:29 PM

Quote from kpahuitsing

Hi carloswalter / AppleTreeChen / JCW308 ,
In public beta OS 12.0.1, we've implemented a fix which should solve this problem. If you want, you can test out that version and check if it solves your problems.

I upgraded to beta os 12.0.1 to test and it's still like before:
1. after accessing the bluetooth background music, it is easily disturbed, the LED bar flashes randomly and then the rig button turns yellow
2. after turning off bluetooth, it stays stable for a relatively long time, but still turns yellow after a while

In any case, it's not a big deal and it doesn't affect your playing, it just feels like it's magical

kpahuitsing · November 21, 2024 at 11:51 AM

hmm... sorry to hear that it still wasn't fixed in 12.0.1

so: in the current release : 12.0.3 we've implemented an even more strict mechanism to avoid those pesky spontaneous movements... during our tests they're gone now. We would love to hear from you if this solves the problems for you too.

AppleTreeChen · November 21, 2024 at 12:05 PM

Quote from kpahuitsing

hmm... sorry to hear that it still wasn't fixed in 12.0.1
so: in the current release : 12.0.2 we've implemented an even more strict mechanism to avoid those pesky spontaneous movements... during our tests they're gone now. We would love to hear from you if this solves the problems for you too.

Yes, after upgrading to OS 12.0.2.56077 Public Beta yesterday, I tested it for a couple hours and the issue has been resolved!

Thanks to Mr. kpahuitsing for his continued follow up and to the KEMPER techs for their efforts!

carloswalter · November 26, 2024 at 8:14 PM

Same here! Played through the KPP while playing music through Bluetooth for a while and no random or spontaneous changes to parameters. Thanks Kemper!