MOTM

I am curious about the way my recently built MOTM-120 behaves in a certain
situation, and am wondering if:

a. it's perfectly normal
b. I made a building mistake
c. I have a bad component

Can somebody perform the test below and see if you can reproduce my results?

Here's the test:

1. Plug the Vibrato (or Random) output of the MOTM-100 into the 120 B input,
nothing in the A input.
2. Set to Cross mode, and turn up some divider output pots. No sound, right?
3. Excite the circuit by plugging a brief burst of noise into the A input,
then unplug.
4. Do you hear clicks on the output now?

To summarize, in Cross mode with a non-audio CV into the B input, I hear
clicks on the output whenever the A input is gated off (or when it's
removed). Turning off the octave mix pots removes the clicks.

So does anybody else see this, or do I have a problem?

Dave Bradley
Principal Software Engineer
Engineering Animation, Inc.
daveb@...

In a message dated 3/30/99 12:17:49 PM, daveb@... writes:

>1. Plug the Vibrato (or Random) output of the MOTM-100 into the 120 B input,
>nothing in the A input.
>2. Set to Cross mode, and turn up some divider output pots. No sound, right?
>3. Excite the circuit by plugging a brief burst of noise into the A input,
>then unplug.
>4. Do you hear clicks on the output now?
>
>To summarize, in Cross mode with a non-audio CV into the B input, I hear
>clicks on the output whenever the A input is gated off (or when it's
>removed). Turning off the octave mix pots removes the clicks.
>So does anybody else see this, or do I have a problem?

Hi Dave,

I checked your patch and mine does that and much more! I think it may be due
to 60Hz and the low level needed to get the 120 clicking. Since I'm using
banana cables (ie, unshielded) I'm picking up all kinds of crap so mine fails
your test number 2 (yet another reason to change back to the MOTM 1/4"
standard). I also noticed that the rhythm would change by toggling the mix
switches after I got it clicking.

More fun with the 120!
John B.

Also thanks to Roy and Gur for the previous postings of patches; a patch is
worth a thousand e-mail's!

Hi Dave,

I tried your patch as indicated, and found the clicking sound at the o/p
without needing to hit the A i/p with noise. All of the divider pots had an
effect also.

When the B i/p was hit with a burst of noise, I found that either the click
would stop, until hit again, or the click would change pattern.

I was using 1/4" patch cables.

Hopes this helps.

Mark


-----Original Message-----
From: JWBarlow@... <JWBarlow@...>
To: motm@onelist.com <motm@onelist.com>
Date: Tuesday, March 30, 1999 10:22 PM
Subject: [motm] Re: Can somebody verify this behavior?

>From: JWBarlow@...
>
>
>In a message dated 3/30/99 12:17:49 PM, daveb@... writes:
>
>>1. Plug the Vibrato (or Random) output of the MOTM-100 into the 120 B

input,

>>nothing in the A input.
>>2. Set to Cross mode, and turn up some divider output pots. No sound,

right?

>>3. Excite the circuit by plugging a brief burst of noise into the A input,
>>then unplug.
>>4. Do you hear clicks on the output now?
>>
>>To summarize, in Cross mode with a non-audio CV into the B input, I hear
>>clicks on the output whenever the A input is gated off (or when it's
>>removed). Turning off the octave mix pots removes the clicks.
>>So does anybody else see this, or do I have a problem?
>
>Hi Dave,
>
>I checked your patch and mine does that and much more! I think it may be

due

>to 60Hz and the low level needed to get the 120 clicking. Since I'm using
>banana cables (ie, unshielded) I'm picking up all kinds of crap so mine

fails

>your test number 2 (yet another reason to change back to the MOTM 1/4"
>standard). I also noticed that the rhythm would change by toggling the mix
>switches after I got it clicking.
>
>More fun with the 120!
>John B.
>
>Also thanks to Roy and Gur for the previous postings of patches; a patch is
>worth a thousand e-mail's!
>
>------------------------------------------------------------------------
>Have you visited our new web site?
>http://www.onelist.com
>Onelist: Helping to create Internet communities
>

Thanks to all who tried my patch. It appears my 120 is behaving normally. I
sat and listened to a suboctaved noise sequence for several hours last night
while soldering patch cables. My family thinks I am nuts.

I really need those oscillators!

Dave Bradley
Principal Software Engineer
Engineering Animation, Inc.
daveb@...