MOTM

I seem to remember somebody was working on an MOTM panel for a ribbon 
controller.  Did it use the Doepfer ribbon unit?

Some people seem to like the Doepfer ribbon but say the electronics can 
be improved.  Is this a Stooge project?

An equiring and cluttered mind wants to know.  Thanks!

Ivan

Scott Juskiw's project:

http://www.tellun.com/motm/diy/tln854/TLN-854.html


As soon as all my cables are shipped, we will be starting up the panel
process full steam.

Larry

-----Original Message-----
From: motm@yahoogroups.com [mailto:motm@yahoogroups.com]On Behalf Of
ivancu@...
Sent: Sunday, September 25, 2005 9:53 PM
To: motm@yahoogroups.com
Subject: [motm] MOTM ribbon controllers - Doepfer and PAIA?


I seem to remember somebody was working on an MOTM panel for a ribbon
controller.  Did it use the Doepfer ribbon unit?

Some people seem to like the Doepfer ribbon but say the electronics can
be improved.  Is this a Stooge project?

An equiring and cluttered mind wants to know.  Thanks!

Ivan

>http://www.tellun.com/motm/diy/tln854/TLN-854.html
>As soon as all my cables are shipped, we will be starting up the panel
>process full steam.

Great stuff; thanks!

Silly question - will the CV output of the panel be raw, non-quantized 
information?  I want to be able to use the CV out as a source of 
continous control voltages like the "old fashioned" ribbon controllers.

Ivan

ivancu@... schrieb:

>> Silly question - will the CV output of the panel be raw, non-quantized 
>> information?  I want to be able to use the CV out as a source of 
>> continous control voltages like the "old fashioned" ribbon controllers.

As far as I understand Scott's project: sure!
I'm using the original R2M hardware at the moment and I also have hope
that the "glitch-problem" will be ironed out with the more reliable
analouge path Scott's circuit provides. *)
I'm not a big fan of Doepfer hardware but unfortunately a Ribbon
Controller is not a widespread gadget  :-( 

 HTH, Michael.

*) My R2M's CV is not smooth. I can't see exactly what it is, I just
can hear it. A simple LP-Filter in the CV path eases this problem. I
got two examples I made to show:
First the VCF's frequency modulated by an LFO (4 ups) and then
manually by using the pressure sensor of the R2M:
http://bluemole.com/misc/r2m-glitches.mp3
Then with the filter hooked up. First out, then in:
http://bluemole.com/misc/r2m-glitches_filtered.mp3

The R2M is digital on the inside and can generate both quantized and 
continuous control voltages. But digital control voltages are never 
truly smooth, they are always quantized at some level. However, I've 
been using mine for 8 months and I haven't had any problems with 
stepping or zipper noise. If your ears are more sensitize than mine, 
you can always put the output through an MOTM-820 to smoothen things 
out. I actually like to do that so that I can get a slow glide going 
up in pitch and a quick glide going down in pitch.

I'm not sure why you are having that glitching problem with the 
pressure output. Mine is quite smooth. They did replace the pressure 
sensor recently, perhaps that's part of the problem (I have the 
original version).

>  >> Silly question - will the CV output of the panel be raw, non-quantized
>>>  information?  I want to be able to use the CV out as a source of
>>>  continous control voltages like the "old fashioned" ribbon controllers.
>
>As far as I understand Scott's project: sure!
>I'm using the original R2M hardware at the moment and I also have hope
>that the "glitch-problem" will be ironed out with the more reliable
>analouge path Scott's circuit provides. *)
>I'm not a big fan of Doepfer hardware but unfortunately a Ribbon
>Controller is not a widespread gadget  :-(
>
>  HTH, Michael.
>
>*) My R2M's CV is not smooth. I can't see exactly what it is, I just
>can hear it. A simple LP-Filter in the CV path eases this problem. I
>got two examples I made to show:
>First the VCF's frequency modulated by an LFO (4 ups) and then
>manually by using the pressure sensor of the R2M:
>http://bluemole.com/misc/r2m-glitches.mp3
>Then with the filter hooked up. First out, then in:
>http://bluemole.com/misc/r2m-glitches_filtered.mp3
>

Hi Scott,

> I'm not sure why you are having that glitching problem with the 
> pressure output. Mine is quite smooth. They did replace the pressure 
> sensor recently, perhaps that's part of the problem (I have the 
> original version).

as I understood the original version needs much more pressure applied to 
achieve the same output voltage.
I think it's a quatization problem. I put a simple LP filter in there 
and it got much better. A lag processor like Tony's Little Lag or a 
MOTM-820 should do a good job on this.
I did a frequency analysis on this and think the noise is from 
transients caused by quantizing.
As soon as they're smoothed out it's virtually gone.

  Michael.

>>  >> Silly question - will the CV output of the panel be raw, 
>> non-quantized
>>
>>>>  information?  I want to be able to use the CV out as a source of
>>>>  continous control voltages like the "old fashioned" ribbon 
>>>> controllers.
>>>
>>
>> As far as I understand Scott's project: sure!
>> I'm using the original R2M hardware at the moment and I also have hope
>> that the "glitch-problem" will be ironed out with the more reliable
>> analouge path Scott's circuit provides. *)
>> I'm not a big fan of Doepfer hardware but unfortunately a Ribbon
>> Controller is not a widespread gadget  :-(
>>
>>  HTH, Michael.
>>
>> *) My R2M's CV is not smooth. I can't see exactly what it is, I just
>> can hear it. A simple LP-Filter in the CV path eases this problem. I
>> got two examples I made to show:
>> First the VCF's frequency modulated by an LFO (4 ups) and then
>> manually by using the pressure sensor of the R2M:
>> http://bluemole.com/misc/r2m-glitches.mp3
>> Then with the filter hooked up. First out, then in:
>> http://bluemole.com/misc/r2m-glitches_filtered.mp3
>>