Posts by Xisale

I also bought high quality coaxial cables on purpose for these recordings.

As you can see in the linked picture, yes, I clocked the the Focusrite to SPDIF. I don't understand why it doesn't work.

Quote from Yoda Guitar

Frist things first,
-- what Interface do you use ?

-- what DAW do you use ?

Kemper has to be S/PDIF MASTER. So eg. Focusrite has to stupid for S/Dif Clock (not Internal)

If you don't have a track that you can reamp,
try to remove it with a plugin or manually search for "remove clicks and pops" on youtube

Hi Yoda,

I use a Scarlett Focusrite 6i6 interface and Logic Pro X.

As you can see in the picture I posted above, I synced the Focusrite with SPDIF before recording. Is it enough to make the Kemper the master clock or am I missing something?

I would still like to find a definitive solution for this. Even if I am willing do to all I can to save these tracks, I don't intend to do these kind of things everytime I record a guitar track.

Thanks for the advises!

Actually, at this point, I would prefer to spend a few hour in fixing the cracks with Izotope RX7 (if it actually works) than recording everything all over again.

I did my absolute best to record these tracks and I would really be pissed of if any click would be hearable on the final mix.

I would still be very interested to hear what would the Kemper engineers would tell us about that. If there is a SPDIF on the Kemper, we are supposed to be able to use it, right?

OK, thanks for your help then! Let's see if someone else has an idea.

I have the 7.2.2 version (last one available for download on the Kemper website).

I have followed this tutorial to set my interface :

Here is a screenshot of what I did in linked file.

Did I forget something?

The latency is audible only once I have recorded. At the moment where I play, there is no audible latency.

I have recorded many times with the analog out and there was no cracks. I'll try again today to be sure.

Thanks for your answer. There wasn't any effect on the KPA when I was recording this, not even any tweak or volume change on the profile. I used the git/stack output. The small extract I posted is not a reamp, it's the SPDIF stack recording.

When I asked if it's useless, I meant: Is there a way to make it work? If it works, of course, it's a great thing, but if it makes cracks when recording, then it's useless.

I didn't change the buffer size on Logic pro. I just clicked on the "Low latency mode" because if I didn't, I would get a huge and very audible latency. I did put a few plugins in my DAW but they were all deactived when recording.

The monitoring comes from the interface. If I click on the monitoring button on Logic pro, then I get the 2 monitorings at once and it creates a horrible phasy tone.

So there is no way to save these takes?

Does it mean that the Kemper's SPDIF connexion is useless and that it's impossible to record the DI track while recording the processed track?

These profiles are totally awesome. Thank you very much!!

Hi,

I've just finished to record a song using SPDIF with the the KPA. After I finished to record everything, I realized that many cracks appear on my recordings, which is really annoying for me to see, since I've spent a lot of time on these recordings and I'm very satisfied with what I played.

Here is an extract in linked file. I had to compress it to high quality mp3 to upload it here but I can assure you that it sounds the same in wav.

So my question is: Is there a way to save my recordings and to make these cracks disappear?

I would really be pissed off if I had to record all my song all over again.

I do have the DI tracks recorded, but I don't know if they will always make the cracks appear or not, using different software and hardware. I tried to reamp with it but cracks appear again...

To anticipate some of your questions: Yes I have synced my audio interface with the SPIDF source, and both the Kemper, my DAW and my audio interface were clocked to 48 kHz.

And my KPA software and Rig manager are updated to the newest versions.

Quote from molin

Xisale! You just saved me a lot of headache. I had the same issue (not using SPDIF though) Anyway I had phase issues when double tracking guitars. I tried the change that you did and bingo it worked! Thanks!

I'm glad if it was helpful!

Thank you both for the answers.

Constant latency is checked and yes, my interface is clocked with the output of the Kemper. But I still have this phase problem...

EDIT : I have found the solution! The output was set to "main output", I tried to change it to "guit/stack" and then, no phase problems anymore.

I don't know exactly why does it make a difference but it worked!

Hi there!

I want to record a song using the S/PDIF reamp technique by using 3 different profiles of the same amp with 3 different microphones, and then mix them together.

I did some tests and there is a problem: when I try to record in 48Khz, it creates phase problems between the takes.

I have checked that both the Kemper, my DAW and my audio interface were set in 48Khz, but the phase problem remains.

I have tried to record in 44Khz and then it works! The 3 profiles match well and there is no phase problem.

But I need to record in 48Khz... Could someone help me with this, please?

Quote from Wheresthedug

i have no doubt that the current profiling technology can’t do what you are requesting as it was never designed with this in mind. The limitation isn’t processing power itself but the way profiling works. However, as you point out computer processing power has increased massively over time. Modelling software design has also developed significantly in that time. I am pretty sure that the way to achieve what you are looking for is with a component level modelling like Fractal or Line6. Some hink they are already as good as Kemper while others think the Kemper still has the edge. Regardless of the current state of affairs I am confident that modelling technology and computing power will advance to catch up with Profiling in term of realism long before a profiling process is ever developed that allows the sort of “full profiling “ you describe.

the single unique selling point of the Kemper is the ability to accurately capture a snapshot of your own amp and cabinet exactly the way you like it then use it consistently without the weight and reliability/consistency issues of valves. Nothing else can do that like the Kemper just now. I don’t think Kemper will go down the road of reinventing the wheel to achieve modelling via a different process but I’ve been wrong before ?

You make a good point.

It's probably just my frustration talking.

When I bought my KPA, I was confident that when a seller would create a profile pack for an amp, he would profile all kind of different EQs for each amp to give a wide choice to the users. But I was wrong.

Look at choptones or Cililabs data sheets: All the profiles they make are mid scooped and/or have tons of bass.

That's exactly what I wouldn't do.

Maybe I should have bought an Axe FX

Quote from Navar

Than you would have to move multiple knobs on the amp at the same time and tell the Kemper at the same time what it actually measures. I would go a complete different way and let the device learn how the amp reacts. Let it learn if there is any interaction between the EQ curves and if how big the interaction is. In some cases you can get away with not so many measurements and calculate the rest by yourself and in some cases you need more information. Speech recognition is a bit similar and got it's quality from training the algorithm.

You seem quite knowledgeable about how the Kemper works. I don't know exactly how it works, but obviously, what I was talking about would need a different way to profile than the current one: Instant and real time profiling (or almost). I don't know if this will ever be possible but I'd like to think that someday will be. Look at how the computers have evolved in no time: Even an average smartphone of today is way more powerful than the computers we had 20 years ago... And the KPA is about 8 years old already.

About the data storage: I have to admit I am puzzled. If the KPA can store no more than 1k profiles, it means it has no more than 6 or 7 Mo of internal memory. Let's say double for the effects, so 15 to 20Mo. That's nothing! With today's possibilities, I don't see how the storage would be a problem.

Quote from Navar

In my personal opinion this would only make sense for direct profiles without the additional interaction from the speaker or microphone. From a technical point of view this would require a whole bunch of measurement points. I'm sure, that you don't need every .1 step in between the EQ settings but you would need enough measurements to capture the behavior and interaction of the knobs.

The challenge would be do develop a kind of learning algorithm which learns how many and which measurements are really needed to capture the amp. If you only capture every second EQ value and one capture would take about 45 seconds, you would need about 2 hours to do this, without the time to document, setup and so on. This time could be reduced if the algorithm is smart enough to guide you through the capture process.

But there is another problem, not every amp is equal, some have presence, some have resonance and so on, this could lead to many combinations and situations which you have to go through.

I think the problem is not that it's not doable, the problem is more if you can develop a way to bake this into an interface the user can use. What I can image first is a way to capture the gain by multiple measurements.

Interesting answer! What you describe would be comparable to doing "motion picture". If you need to picture every frame to create the video, then yes it will take ages to make. But maybe there could be a way to profile more like a video camera?

I have really no idea of what is possible and what isn't from a technical point of view.

Maybe doing that only for direct profiles would be more realistic indeed. I really have no clue.

I understand that. I really have no idea of what the KPA is able or not able to do of in terms of processing.

In my opinion, the Kemper sounds more "realistic" than the Axe FX, plus I really like the fact that it just respects the mics you are using and how you place them in front of the cab, etc...

But to me, the augmented reality of the KPA is where it is weak compared to an Axe FX.

Once the profile is made, I really find that the best option to keep its realistic vibe is to do absolutely nothing.

Quote from Wheresthedug

I understand what you are asking but the interaction is real time so simply having all the positions of the Treble knob while the B and M are at noon isn’t enough. You need to have all the possible positions of all knobs with all possible positions of all the others.

This was just an example. you could make a more a less long "video profile". For example, just rolling the Treble Knob could last for 5 seconds, no more. One Kemper profile weighs about 6Ko, which is almost nothing. A video typically uses 24 frames per second. If you'd make a 5 seconds video profile, then you would have a file of 6x24x5= 720Ko. That's not even 1Mo. And you would have plenty of frames (profiles) available in it that you could use.

You could obviously make more complex video profiles where you would turn the knobs in different combinations and make it last for 30 seconds or so. That would weight only 4,320 Mo. Still not so much IMO. You wouldn't necessary have ALL the different combinations possible, but you would already have so much more choice than what you have when you buy a bundle of profiles.

If there was a solution to make "full profiles" or "video profiles", then the Kemper would be the absolute perfect machine.

Maybe the KPA is able to do it or maybe not. Maybe this is where we would need a "KPA 2" ?

Quote from Wheresthedug

unfortunately that’s not how Rome knobs work though. They are all interactive so the position on the treble knob also affects the bass and mic knobs. Also the gain and master volume positions affect the tone as well as affecting each other. Plus all of those have less effect than the speaker and mic type and placement so the idea is nice in theory but totally impractical IMHO

I am conscious that all the knobs are interactive. But this doesn't contradict my idea.

If you'd make this "all the mids possible" profile, then you would have all the reactions of the amp with all the mids settings possible (and the rest at noon. Or not) in one profile.

Imagine you are watching a video of a guy trying an amp on Youtube, and while he is playing, his friend is rolling the knobs on the amp, and at some instant you think "I like what I hear there ! Too bad he didn't stop on this setting".

With what I'm suggesting, you could do it.

That's all I am saying.

Marshall2550: I tried that too, but I didn't find any studio which owns a BE100 or a SLO100. These are pretty rare amps.

xzyryabx: OK my bad then. Did you have the same idea of a profile with a time length in which you could pause? I have searched your name in the research function and didn't found the topic.

Bommel : I have actually already tried most of your profiles. They are among the bests imo! I may actually chose one of them for my studio tone. So thank you so much for giving all of these profiles for free! It's greatly appreciated.

Btw: I tend to think more and more that "everything at noon" is the best setting for an amp Maybe slight adjustments here and there but if you dont like the sound of the amp with everything at noon, then the amp is not for you.

I keep thinking about my "video over picture" idea, though.

Imagine that you'd make a "video profile" of an amp.

For example, you would have all the EQ knobs in the middle position, and while the KPA is making the profile, you would slowly roll the Mids knob in a way or the other. So in the end you would get a "all the mids setting possible" video profile (which means a profile that has a length in time) in which you could pause wherever you want when you like the sound. It seems pretty realistic to me, especially considering that the current profiles use almost nothing for storage.

Having the whole amp settings possible in one file would obviously be even better, but if you'd tweak many things in a long "video profile", that could work imo.