A137 Wave Multiplier

richard · Post by **richard** » Tue Jun 09, 2009 10:50 am

okay wetterberg, audio is waiting for ya

My first modular demo, haven't felt moved to bother before but I think this itsterest. Hopefully this works:

A137 CV mangling monkeyshit

The RS90 as an LFO is going to the A137 and the CV ouput is modulating the M15 and M12 filter. the A137 is being modulated by the the M15 and RS90 and by itself. There is a bit of cross modulating between the VCOs but most of what your hearing is a pretty simple LFO made very complex by the A137

I moved the freq knobs on the VCOs and filter around a little for these performances

Richard

wetterberg · Post by **wetterberg** » Tue Jun 09, 2009 11:38 am

click "post reply" - not quick reply, scroll down a bit to see the "add an attachment" button

richard · Post by **richard** » Tue Jun 09, 2009 12:01 pm

i posted a link above

wetterberg · Post by **wetterberg** » Tue Jun 09, 2009 12:05 pm

I think you need a different link, that one is to the administrative tools, it needs a login etc.

richard · Post by **richard** » Tue Jun 09, 2009 12:29 pm

bollocks - I corrected it. it should work now

A137 CV mangling monkeyshit
R

wetterberg · Post by **wetterberg** » Tue Jun 09, 2009 2:30 pm

that's... pretty mad

Epignosis567 · Post by **Epignosis567** » Tue Nov 20, 2018 10:02 pm

richard wrote:I need to point out that at least on my A-137 these settings don't actually work.

Multiples....Fully to the left (0 marks)
Folding level....fully to the left (0 marks)
Symmetry...3.5 marks from fully left
Harmonics.... 2 marks from fully left
Level....2 marks from fully left.

If I input a sine form an m15 the signal is noticebly folded even at the lowest level - I can't find any useful default setting. The only wayI can find to try to get a sine through it unaffected is to attenuate the signal level so low that the signal disappears

Richard

SECONDED. Anyone else have this problem? Wondering if I got a defective unit.

authorless · Post by **authorless** » Tue Nov 20, 2018 10:53 pm

Epignosis567 wrote:
richard wrote:I need to point out that at least on my A-137 these settings don't actually work.

Multiples....Fully to the left (0 marks)
Folding level....fully to the left (0 marks)
Symmetry...3.5 marks from fully left
Harmonics.... 2 marks from fully left
Level....2 marks from fully left.

If I input a sine form an m15 the signal is noticebly folded even at the lowest level - I can't find any useful default setting. The only wayI can find to try to get a sine through it unaffected is to attenuate the signal level so low that the signal disappears

Richard
SECONDED. Anyone else have this problem? Wondering if I got a defective unit.

If you have the fold level set really low like this then the signal is going to fold at a really low level. If you want a default with no folding: Multiples: 0/fully counter clockwise; Fold Level: max/fully clockwise; Symmetry: 5/middle; Harmonics: 0/fully counter clockwise. Level not all the way up, adjust to where it sounds correct.

Epignosis567 · Post by **Epignosis567** » Wed Dec 05, 2018 7:59 pm

authorless wrote:
If you have the fold level set really low like this then the signal is going to fold at a really low level. If you want a default with no folding: Multiples: 0/fully counter clockwise; Fold Level: max/fully clockwise; Symmetry: 5/middle; Harmonics: 0/fully counter clockwise. Level not all the way up, adjust to where it sounds correct.

Yes, this is what I have been getting an ALMOST unaffected signal with, but really it's still pretty damn mangled when looked at under a scope. Anyone else able to chime in? The notion of getting a signal to pass through this thing unaffected is crazy to me and not possible on mine, so I would like to be sure I don't have a defective module.

authorless · Post by **authorless** » Wed Dec 05, 2018 8:05 pm

Epignosis567 wrote:
authorless wrote:
If you have the fold level set really low like this then the signal is going to fold at a really low level. If you want a default with no folding: Multiples: 0/fully counter clockwise; Fold Level: max/fully clockwise; Symmetry: 5/middle; Harmonics: 0/fully counter clockwise. Level not all the way up, adjust to where it sounds correct.
Yes, this is what I have been getting an ALMOST unaffected signal with, but really it's still pretty damn mangled when looked at under a scope. Anyone else able to chime in? The notion of getting a signal to pass through this thing unaffected is crazy to me and not possible on mine, so I would like to be sure I don't have a defective module.

Turn down the input signal.

Epignosis567 · Post by **Epignosis567** » Thu Dec 06, 2018 11:40 am

authorless wrote:
Turn down the input signal.

Thanks but

I do understand. My point is that there is no point of attenuation in which an original signal can be recovered from this module. And in light of the fact that other posts here have described settings that are so completely out of line with what would be possible to pass on an unaffected signal via my own module I just want to clarify that I’m not the only one having these issues. There is no way to get an unaffected signal to pass through. And I’m wondering if these other posters were to put their own under a scope they wouldn’t realize that it’s the same for them

MRoyce · Post by **MRoyce** » Thu Dec 06, 2018 3:24 pm

Since you have a scope you should be able to get some useful settings out of it with an hour or two of experimenting. Here's what works for me:
(0 is all the way to the left, 10 all the way to the right)
Input level on 2
Multiples at 0
Folding Level at 4
Symmetry at 4
Harmonics at 1

That's clean(ish) and turning up or CVing the multiples increases the folding from subtle to strong. Harmonics further increases the folding effect. You're not having "issues", the wavefolder is just wavefolding. If you want something that's more plug'n'play, the wavefolder on the disting is very nice and straightforward. Maybe the module just isn't for you.

Post by **Rigo** » Fri Dec 07, 2018 7:13 am

Epignosis567 wrote:My point is that there is no point of attenuation in which an original signal can be recovered from this module. And in light of the fact that other posts here have described settings that are so completely out of line with what would be possible to pass on an unaffected signal via my own module I just want to clarify that I’m not the only one having these issues. There is no way to get an unaffected signal to pass through. And I’m wondering if these other posters were to put their own under a scope they wouldn’t realize that it’s the same for them

You have the original signal ... at the input of the module. Whatever the settings on the module, the signal goes through 4 folding stages so don't expect it to come out unaltered. Use a mixer or crossfader if you want to go from original to folded and back.

Post by **Rigo** » Wed Dec 12, 2018 1:20 am

When Dieter Doepfer is demoing the A-137-1 he is always starting with dialling in settings that let the original waveform pass more or less unchanged ... he didn't say completely unchanged

Something else that might be confusing is the sketch with all the bits and pieces ... because it is not correct. The folding level defines the width of a voltage interval, the symmetry defines where the interval is. So in stead of 'a+b' and 'a-b' it should be 'b+a' and 'b-a' as upper and lower clipping levels (with 'a' being folding level and 'b' symmetry).

And maybe, since the 4 stages of the A-137-1 are all very similar to the A-136, there is an amplification done. It is possible to modify the A-136 to not amplify, don't know if this is possible with the A-137-1 ... so turning down the input level will have to do. (I should ask this on the Doepfer Yahoo group)

Epignosis567 · Post by **Epignosis567** » Wed Dec 12, 2018 10:12 am

Got it, thanks. It's not that I was expecting a signal to be able to pass unchanged, it's that all the OPs here were saying that they could get a signal unchanged with settings that are completely at odds with my own module, that was the point of confusion.

MOD WIGGLER

MOD WIGGLER

A137 Wave Multiplier