Posts by Dragonsf

I created the circuit in Multisim and the simulated results are:

The simulated values are:

I was able to finish the circuit on a perf-board. After some measurements, I found the following settings on the KPA getting the sound quite right:

The resulting KPA settings are:

Anyone tried that? I can't get it right.

Quote from Drapes

Any luck on the petrucci wah or we still at war with each other?

What is your suggestion?

Yes of course. Studied all threads for this, gave me the inspiration for my research.

Here you are:

https://docs.google.com/spread…10ahN2PE/edit?usp=sharing

If you find errors in the sheet, please report.

You have to play with the Peak setting, to get the correct sound.

I also calculated the lower frequency and higher frequency from the given group's Wah settings:

https://docs.google.com/spread…10ahN2PE/edit?usp=sharing

FYI: I think I got all the related data to create the KPA settings for any given Wah. If anyone is interested, I'll create a spread sheet, where you can look up all my compiled data so far or create your own KPA settings. Just ask.

No thanks, the volume is good enough for measuring. I got some nice consistent result BTW.

I measured the frequency response from the wah effect, by sending a white noise signal and measured the spectrum at the output.Peak Position (Q) was at 5 and Peak Range (drive was at 0%). The graph is logarithmic and I disregarded everything above 4000Hz. The pedal range was measure only in the negative range, in the positive range toe frequencies are higher then heel.

Quote from paults

Here are my thoughts:

Bypass Stack.

Turn off all other FX.

Set all Output EQ settings to "0"

Thanks, it works.

As I'm trying to analyse the wah-settings (KPA-In: sinus-sweep,KPA-Out->bela-audio dsp->spectral analysis) I need the most undistorted and clean settings. Any help is appreciated.

Regarding the inductor-less CS Wah:

It seems, the Q-Factor depends on the pot setting from 2 (Top = 100k) to 5 with a resonant peak at 440Hz with 11. Can we do that with KPA Wah?

BTW: I collected the data for some wah types previously:maybe that could help someone. BTW: Do we know, what the KPA Wah settings mean in terms of Freqeuncy range and Q-faktor?

Any news about Colorsound settings (inductor-less and Fuzz/Wah part)?

I'm trying to rebuild the circuits on Vero at the moment to do some FFT, but a comparison would be fine.

Quote from Antipodes

Looks like a 330 with humbuckers - did you build it or simply refinish it?

I've build it from scratch. Bought the wood in china, everything else from over the world. The Humbuckers were custom made by Stew Mac for me. Japanese GoTo Tuners, bone nut and brass bridge and tail.

My latest creation. It took me about 4 month to get the finish right (too cold for color-spraying). But I'd say, it was worth the time.:

I haven't read all the 56 pages in the F&Q thread, but which profile (of the 15000+ in the Rig exchange) would be most useful for testing the Kone sound? ATM I'm using the M Britt Dumble profiles, and I can't hear much differences between the imprints. The Kone sounds very god though. Better than my Yamaha DXR12.

Quote from benvigil

There is another wish list item for adding MIDI-over-USB to the Kemper. It wouldn't surprise me if that were not possible due to hardware limitations.
That said, the MIDI implementation is pretty comprehensive: there are over 300 NPRN parameters (800+ if you count the 3 other stomps and X and Mod slots). The bottom line is... it's a lot of work to implement all that in a reasonably usable GUI when you're working for free.

I'd only create a KPA Editor if I saw a reasonably good chance it would help feed my family. Given that everyone wants everything to be free and Kemper just might surprise us and release a KPA Editor... I don't think I'll be spending any time working on one.

MIDI over USB is possible (did some testing), but as the protocol is not documented, at some point the connection breaks. Protocol is using sysex and not nrpn (AFAIK).

Quote from ColdFrixion

Did you ever use the KPA MIDI Control editor?

Which is what?

Quote from nightlight

I seriously doubt the reason previous attempts have failed is because people were short of funding.

I think a bigger hurdle is that Kemper Amps does not want to provide the necessary information to make third party attempts at an editor viable.

There's obviously stuff going on under the hood that they don't want other users or competitors to access. That's why most people have abandoned development after some initial promising results.

I tried to implement the Ctrlr application with MIDI over USB to no avail. As long as the relevant protocol and SysEx information is not available outside Kemper, it's of no use trying.Besides that, some information is not valid anymore. Whatever you offer to an ouside programmer, at some point he'll stuck, as KPS doesn't respond anymore. If you dump the KPA/Rig Man communication, you can see there is a lot going on on undocumented SysEx data.