MOTM

The MOTM-120 has been sold.  Thanks to everyone who inquired.

Graham

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I was surfing the net a bit and stumbled over this link:
http://www.techman.synth.net/techman_website2_00002e.htm
copy:
"When it came to testing this module, I was a little perturbed that it 
didn't work as I expected. in sub mode, turning up each of the four sub 
octave pots produced glitches in the audio if I had signal on both the A 
IN and B IN jacks. This couldn't be right. ... This time I happened to 
put the scope probe on the non-inverting input of the input comparator, 
and lo, the glitching stopped. Aha.. the capacitance of the scope probe 
had stopped the clock jitter. Solution: I happened to have a couple of 
18pF ceramic caps handy, so I put these across the non-inverting input 
and ground (Pins 2 & 1) of both of the 311 comparators. Problem solved. 
The module now appears to work as intended...."

Since I was experiencing the same problem, I tried it out.  I needed to 
take apart the whole module to be able to fit the caps, but the result 
is very nice. Now I know what a MOTM-120 should sound like. Very cool!

Cheers,
Tom

In the SUB mode it should not matter what is going to input B at all.  
The B input should be ignored.  Why would eliminating "clock jitter" on 
the B input make any difference?  It seems to me this has little to do 
with what mode the 120 is in, because in the scenario described there 
are inputs on both A and B, and the solution is to modify both comparators.

Paul, what is your take on this modification?

-Richard Brewster

Tom Adam wrote:

>I was surfing the net a bit and stumbled over this link:
>http://www.techman.synth.net/techman_website2_00002e.htm
>copy:
>"When it came to testing this module, I was a little perturbed that it 
>didn't work as I expected. in sub mode, turning up each of the four sub 
>octave pots produced glitches in the audio if I had signal on both the A 
>IN and B IN jacks. This couldn't be right. ... This time I happened to 
>put the scope probe on the non-inverting input of the input comparator, 
>and lo, the glitching stopped. Aha.. the capacitance of the scope probe 
>had stopped the clock jitter. Solution: I happened to have a couple of 
>18pF ceramic caps handy, so I put these across the non-inverting input 
>and ground (Pins 2 & 1) of both of the 311 comparators. Problem solved. 
>The module now appears to work as intended...."
>
>Since I was experiencing the same problem, I tried it out.  I needed to 
>take apart the whole module to be able to fit the caps, but the result 
>is very nice. Now I know what a MOTM-120 should sound like. Very cool!
>
>Cheers,
>Tom
>
>
>  
>

Weird... I'm having this problem too... Thanks for posting this!
 
cheers,
eric f

Tom Adam <tom.adam@...> wrote:
I was surfing the net a bit and stumbled over this link:
http://www.techman.synth.net/techman_website2_00002e.htm
copy:
"When it came to testing this module, I was a little perturbed that it 
didn't work as I expected. in sub mode, turning up each of the four sub 
octave pots produced glitches in the audio if I had signal on both the A 
IN and B IN jacks. This couldn't be right. ... This time I happened to 
put the scope probe on the non-inverting input of the input comparator, 
and lo, the glitching stopped. Aha.. the capacitance of the scope probe 
had stopped the clock jitter. Solution: I happened to have a couple of 
18pF ceramic caps handy, so I put these across the non-inverting input 
and ground (Pins 2 & 1) of both of the 311 comparators. Problem solved. 
The module now appears to work as intended...."

Since I was experiencing the same problem, I tried it out.  I needed to 
take apart the whole module to be able to fit the caps, but the result 
is very nice. Now I know what a MOTM-120 should sound like. Very cool!

Cheers,
Tom




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I had a request regarding the 120 - maybe someone else was thinking the same. Would it 
be possible to get some samples of what it does in terms of just adding the sub-octaves?

I know, it's a boring request, but while it's nice to hear what it's theoretically capable of - 
full-on intermodulated extremeness - for my purposes it'd be much more useful to know 
what it sounds like when *just* adding the sub-octaves.

Some of you might say "it sounds like the original, but with four sub-octaves" but there 
are sub-octaves and there are sub-octaves, if you know what I mean.

just my 2 cents,
Matthew

--- In motm@yahoogroups.com, Tom Adam <tom.adam@p...> wrote:
> I was surfing the net a bit and stumbled over this link:
> http://www.techman.synth.net/techman_website2_00002e.htm
> copy:
> "When it came to testing this module, I was a little perturbed that
it 
> didn't work as I expected. in sub mode, turning up each of the four
sub 
> octave pots produced glitches in the audio if I had signal on both
the A 
> IN and B IN jacks. This couldn't be right. ... This time I happened
to 
> put the scope probe on the non-inverting input of the input
comparator, 
> and lo, the glitching stopped. Aha.. the capacitance of the scope
probe 
> had stopped the clock jitter. Solution: I happened to have a couple
of 
> 18pF ceramic caps handy, so I put these across the non-inverting
input 
> and ground (Pins 2 & 1) of both of the 311 comparators. Problem
solved. 
> The module now appears to work as intended...."
> 
> Since I was experiencing the same problem, I tried it out.  I
needed to 
> take apart the whole module to be able to fit the caps, but the
result 
> is very nice. Now I know what a MOTM-120 should sound like. Very
cool!

> 
> Cheers,
> Tom

--- In motm@yahoogroups.com, "bootlegsounds" <m@b...> wrote:
> I had a request regarding the 120 - maybe someone else was
> thinking the same. Would it be possible to get some samples
> of what it does in terms of just adding the sub-octaves?

Not exactly to your request but I do have one sample of using
the MOTM-120.  I have the Tellun mod and I use the mix out to
drive the CV's on my VCOs.  I run them through a quantizer first
and then tweak the knobs until I get a pattern I like.  There
is one on my samples page - "The Journey"
http://modularsynthesis.com/samples/samples.htm

"Happy" and "Delirious" are very similar only I am using my
PSIM to generate the dividers and I don't use binary (e.g.
divide by 3,5, etc.).  Again, you just tweak the mix until 
you get a pattern you like.

I also added the 100 pF caps to clean up the crosstalk.  It didn't
completely eliminate it but it made it significantly better.  It
now only occurs at above audio frequencies.