The Switcblade GL is buffered, but I remind you that for testing purposes, I am not connecting it, so buffer noise does not explain the problem.
Also.. the buffers in the Switchblade GL are amazingly transparent. Even when it is connected, i do not think it is contributing too much to the noise issue.
For Testing purposes, I am simply plugging my guitar directly into the front input jack, and running the loop with a short cable going from the rear send jack directly to the rear return jack. In this instance, the only way I can increase the input signal is to turn up the volume on my guitar all the way. What is baffling to me is why so much noise is added to the output when the loop is engaged with this configuration. It sounds great without the loop engaged.
What I intend to do in the long run is run the Kemper send into my Sound Sculpture Switchblade GL switching unit, and then back out to the Kemper return. This will allow me to patch in and out various effects in various configurations. I am able to run this setup without the Kemper and get excellent signal to noise.
Thanks again
I just added this to my original post, but it is most noticeable when using the Twin 1 Clean preset
It is unclear to me how to adjust the gain stage as you suggest. In particular, I am not sure how to adjust the return volume. In the output menu, adjusting the direct out volume seems to have no effect on the level of the output to the loop (also, the text for that parameter is grey as opposed to the dark black of the other output parameters... I am not sure what that means). Adjusting the volume paramater within the 'loop' menu also does not seem to be very helpful. With the volume turned all the way down (which is -5db) the overall signal is lower, but the problematic noise is stillpresent at a similar ratio at to before. I am maxed out as far as input gain is concerned from my guitar, effects, or switching unit.
I appreciate your help. Please let me know if I am missing something.
Thank you for your reply. There is no pedal in the loop. As I mentioned before, the exact same issue is present when the guitar is plugged directly into the return jack on the back of the unit. For this recording, the send was going to my Sound Sculpture Switchblade GL, and then back to the return of the Kemper amp. I get the same result even if I run a short cable from the Kemper send to the Kemper return though.
I am having a problem that I am wondering if any of you are having. I am getting significant hiss/static whenever I engage a mono effects loop in position A, B,C, or D. I can get a crystal clear sound when the effects loop is disengaged. I have eliminated the possibility that the noise is coming from outboard gear as the noise in question is present even when I plug my guitar directly into the return jack at the back of the unit.
It is particularly a problem when using the Twin 1 Clean preset
I have included a link to some recordings so that you can hear the difference between the sound with and without the loop engaged.
I contacted Kemper technical support and Sweetwater (whom I bought the original unit from). I was shipped several replacement units (six to be exact) because it was thought that there was a fault with the return jack. Unfortunately, the problem has persisted. The folks at Kemper were able to reproduce the problem, but now they are telling me that it is normal noise in an analogue signal path. I heartily disagree. I can successfully string together twenty stomp boxes and rack units and still get less noise that what I am getting with my guitar plugged directly into the Kemper unit with the loop engaged (even with no effects in the loop).
Is anyone else having this problem? Part of why the Kemper folks are being dismissive is that they say I am the only one with this issue. If the problem is user error, I would gladly be shown the my fault and move on.
At the very least, let me know if you think the background noise level in the 'bad' recording is acceptable or not.
Thanks
