CP-251 with Oberheim SEM Pro?

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Gil
Posts: 21
Joined: Mon Feb 21, 2011 7:45 pm

CP-251 with Oberheim SEM Pro?

Post by Gil » Fri Dec 07, 2012 4:37 am

Hey guys,
I've been trying to find this information everywhere to no avail. Apparently, searching for "CP-251" on these forums returns no results, huh?

My Oberheim Pro has CV ins and outs that output and accept 0-10 volts (lfo out, oscillator outs are 10v). I wanna know if I can use a CP-251 with it, the CP-251 manual says it can generate up to +5v but can the mixer and multiple sections accept 10v CVs? What happens if you go over 5, does it clip the signal or fry the circuits of the CP-251?
If not, can I at least use the attenuator to input a 10v and bring it down to 5v?

Thanks!

ebo
Posts: 135
Joined: Mon Oct 26, 2009 8:41 pm

Re: CP-251 with Oberheim SEM Pro?

Post by ebo » Fri Dec 07, 2012 2:42 pm

the CP251 is a nice tool to mix cv
the S/H out does not work the output voltage is low around 1v.
so I use the LFO from the MP201 mixed in the CP251.
in this vid's I use the Sem patchpannel with the CP251
http://www.youtube.com/watch?v=YlGp-McG ... TiVws_fdGQ

http://www.youtube.com/watch?v=qqfrJb6F ... 42BD99377F

Gil
Posts: 21
Joined: Mon Feb 21, 2011 7:45 pm

Re: CP-251 with Oberheim SEM Pro?

Post by Gil » Sat Dec 08, 2012 7:34 am

Thanks, is th S+H really limited to 1v? Doesn't it depend on the input source?
Also, does the CP-251 handle the SEM's 10v CV outs fine?

ebo
Posts: 135
Joined: Mon Oct 26, 2009 8:41 pm

Re: CP-251 with Oberheim SEM Pro?

Post by ebo » Sat Dec 08, 2012 9:26 am

I try many other clock and noise sources with the CP251 S/H,but it only works if you take all the other channels to amplifie the S/H out,
but then you need another CP for MIxing.the MP201 S/H is working very good and you can sync it with midi clock.
I sended my CP 251 back to Moog but they answered this is normal.
I use many S/H moduls in my Eurorack and every modul is much better than the CP 251 S/H.

EricK
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Joined: Fri Apr 09, 2004 2:09 pm

Re: CP-251 with Oberheim SEM Pro?

Post by EricK » Sun Dec 09, 2012 1:04 am

Can you boost the voltage with the mult and the mixer?
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ebo
Posts: 135
Joined: Mon Oct 26, 2009 8:41 pm

Re: CP-251 with Oberheim SEM Pro?

Post by ebo » Sun Dec 09, 2012 8:28 am

yes I can boost it ,
but I need the CP 251 mixer for the MP 201
and the S/H from the MP 201 works well.
I bought the CP 251 because I want to use the S/H with the Filter MF 101
but without the boost by use all the other channel of the CP 251
the S/H out does not work.I also try other Noise and Trigger sources ( MP201)
it was a little bit better , the internal noise level is too low.
but my other S/H units are much better.
I hope Moog will make a better CP 252?
with extern VCA ins ,a nice resetable LFO and a workin' S/H

Roy
Posts: 28
Joined: Sat May 12, 2012 2:40 am

Re: CP-251 with Oberheim SEM Pro?

Post by Roy » Sun Dec 09, 2012 3:47 pm

Hi,

I'm running the patch panel SEM and a CP-251 and not found the S/H function on the CP251 to be a problem, works fine for me. Although, the other poster seems to be more knowledgable about this stuff than I am. You should also look at getting some of the 1/4 to 1/8" leads that Hosa make (not sure if anyone else makes them).

I really like my rig, which uses a Doepfer Dark Energy (CV-Midi conversion), SEM, CP-251, a few moogerfoogers and a Roland DC-50 analog delay. The CP-251 is really useful in making all this stuff talk to one another.

Cheers,

Roy

slabwax
Posts: 479
Joined: Thu Aug 31, 2006 6:04 pm
Location: Ballard

Re: CP-251 with Oberheim SEM Pro?

Post by slabwax » Wed Dec 12, 2012 2:18 pm

I also use the cp251 s/h with my patch point sem, no problem here. Also the mp201 is good fun with the sem.

Gil
Posts: 21
Joined: Mon Feb 21, 2011 7:45 pm

Re: CP-251 with Oberheim SEM Pro?

Post by Gil » Thu Dec 13, 2012 2:51 am

Thanks for the replies!

Has anyone tried to use the CP-251's attenuators to attenuate an audio signal?

Roy
Posts: 28
Joined: Sat May 12, 2012 2:40 am

Re: CP-251 with Oberheim SEM Pro?

Post by Roy » Thu Dec 13, 2012 3:13 pm

Yes, they work fine. The mixer is useful too - it is spec'ed to allow mixing of audio or cv signals.

One of the advantages of the pro over the patchpanel is that it has an amp in the ext. audio in (or at least one side of it), whereas the patchpanel version does not, so you need to get a pretty hot signal to balance with the SEM's oscillators. This means I don't really need to use the CP-251 to attenuate audio that much, I'm usually trying to go the other way.

Cheers,

Roy

Gil
Posts: 21
Joined: Mon Feb 21, 2011 7:45 pm

Re: CP-251 with Oberheim SEM Pro?

Post by Gil » Thu Dec 13, 2012 6:39 pm

Roy wrote:Yes, they work fine. The mixer is useful too - it is spec'ed to allow mixing of audio or cv signals.

One of the advantages of the pro over the patchpanel is that it has an amp in the ext. audio in (or at least one side of it), whereas the patchpanel version does not, so you need to get a pretty hot signal to balance with the SEM's oscillators. This means I don't really need to use the CP-251 to attenuate audio that much, I'm usually trying to go the other way.

Cheers,

Roy


Thanks. I'd like to attenuate the SEM's audio out (which is very hot) before processing it through guitar pedals. Most synths work great with guitar pedals but the SEM distorts EVERYTHING.
I know I can use an audio mixer or reamp box to bring the signal down but if the CP-251 can do the job it'll save me the money and extra piece of gear.
So you think it can handle the SEM's audio output?

Roy
Posts: 28
Joined: Sat May 12, 2012 2:40 am

Re: CP-251 with Oberheim SEM Pro?

Post by Roy » Sat Dec 15, 2012 4:36 pm

The SEM does seem to have a pretty hot output, but then so does the direct carrier out on the MF Ring Mod.

So, I reckon so, based on not having any problems myself in the past year. But, others may have a view based on tech stuff than plugging things in.

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