MOTM

--- In motm@y..., "Paul Schreiber" <synth1@a...> wrote:

> Well, "Ask and ye shall receive."
> 
> Discuss.
> 
> Paul S.

--- In motm@y..., "Paul Schreiber" <synth1@a...> wrote:
> Well, "Ask and ye shall receive."
> 
> Discuss.
> 

Oops. Sorry for the blank post. Well, I drew the sucker, but that 
doesn't mean I know how it works!

1. What's the LINK jack for?
2. There are 2 CV inputs per vca - 1 exp, 1 lin - and 1 CV 
attenuator. How are those hooked up?
3. How does PAN/FADE mode work - by taking one set of CV inputs, and 
inverting them for control of the other VCA?

Moe

Well, "Ask and ye shall receive."

Discuss.

Paul S.

My guess is the link jack might be a way to chain VCA outputs together
without tying up a mixer, sort of like auxiliary inputs that aren't
controlled by the VCA but just mixed in, but then it would seem like you'd
need two link jacks, not one.

John Loffink
microtonal@...


----- Original Message -----

From: <mate_stubb@...>
To: <motm@yahoogroups.com>
Sent: Saturday, March 24, 2001 12:19 PM
Subject: [motm] Re: MOTM-130


> --- In motm@y..., "Paul Schreiber" <synth1@a...> wrote:
> > Well, "Ask and ye shall receive."
> >
> > Discuss.
> >
>
> Oops. Sorry for the blank post. Well, I drew the sucker, but that
> doesn't mean I know how it works!
>
> 1. What's the LINK jack for?
> 2. There are 2 CV inputs per vca - 1 exp, 1 lin - and 1 CV
> attenuator. How are those hooked up?
> 3. How does PAN/FADE mode work - by taking one set of CV inputs, and
> inverting them for control of the other VCA?
>
> Moe
>
>
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>

synth1@... writes:

>>Well, "Ask and ye shall receive."  Discuss.<<

It's clear, easy to follow and a thing of beauty.  That was until I saw the 
Pan/Fade swtich and remembered it also does that.  In that mode it is no 
longer clear how the module works, what inputs and outputs are used and what 
knobs are used for panning and fading.  Perhaps some extra labeling is 
needed.  There's also a little free space for some kind of diagram graphic if 
needed.

-Elhardt

> My guess is the link jack might be a way to chain VCA outputs together
> without tying up a mixer, sort of like auxiliary inputs that aren't
> controlled by the VCA but just mixed in, but then it would seem like you'd
> need two link jacks, not one.

Inputs *and* outputs are normalized so you will always get the desired
pan or crossfade function. Link jack is if you want to combine
more than 2 VCAs.

You always have *both* CV inputs active at the same time, linear and
exponential. In pan and fade mode, the linear CV is used to pan and fade,
and you can still use the expo input for loudness control.

(In other words, there is no need to run a signal thru more than one VCA
in series for panning and yout final synth voice's VCA - the combination
is done in the CV rather than the audio path.)

JH.

I would much rather have a LINK1 and LINK2 input so VCA outputs can be
combined independently.  This would allow multiple stereo panned signals to
be mixed.  Take OUT1 from the previous MOTM-130, plug it into LINK1.  Take
OUT2 from the previous MOTM-130, plug it into LINK2.  Now the panned mix of
both MOTM-130s is available at the second set of outputs.

If you just want to link (mix) 2 VCAs (nonpanned), then take OUT1 and plug
it into LINK2 on the same module.  The mix is now available at OUT2.

This not only saves a mixer module, it also saves unnecessary controls since
there's already GAIN controls at the VCAs.

John Loffink
microtonal@...

----- Original Message -----

From: <jhaible@...>
To: <motm@yahoogroups.com>
Sent: Saturday, March 24, 2001 4:23 PM
Subject: Re: [motm] Re: MOTM-130


> Inputs *and* outputs are normalized so you will always get the desired
> pan or crossfade function. Link jack is if you want to combine
> more than 2 VCAs.
>
> You always have *both* CV inputs active at the same time, linear and
> exponential. In pan and fade mode, the linear CV is used to pan and fade,
> and you can still use the expo input for loudness control.
>
> (In other words, there is no need to run a signal thru more than one VCA
> in series for panning and yout final synth voice's VCA - the combination
> is done in the CV rather than the audio path.)
>
> JH.
>
>
>

In a message dated 3/24/2001 5:43:40 PM, jhaible@... writes:

>Inputs *and* outputs are normalized so you will always get the desired
>pan or crossfade function. Link jack is if you want to combine
>more than 2 VCAs.

I'm under the impression that it is way beyond too late to make any changes 
to the 130, but I like John's idea (below). I also may still be a bit 
confused (so what's new) about the LINK function. In Juergen's post he 
indicated that module's functions would be determined by its input and output 
configuration -- 
1) one input + two outputs is a VCA with VC Pan, 
2) two inputs + one output is a VCA with VC Crossfading inputs, 
3) two inputs + two outputs is two independent VCAs. 

If that's true, can one use either VCA alone, or does one have to choose say 
VCA1 as the single VCA? I also wonder how the PAN/VCA MODE switch effects the 
module's behavior(assuming the normalizing scheme above is true -- if so it's 
an absolutely great use of normalizing jacks IMO)?

JB

In a message dated 3/25/2001 7:52:52 AM, microtonal@... writes:

>I would much rather have a LINK1 and LINK2 input so VCA outputs can be
>combined independently.  This would allow multiple stereo panned signals
>to
>be mixed.  Take OUT1 from the previous MOTM-130, plug it into LINK1.  Take
>OUT2 from the previous MOTM-130, plug it into LINK2.  Now the panned mix
>of
>both MOTM-130s is available at the second set of outputs.
>
>If you just want to link (mix) 2 VCAs (nonpanned), then take OUT1 and plug
>it into LINK2 on the same module.  The mix is now available at OUT2.
>
>This not only saves a mixer module, it also saves unnecessary controls
>since
>there's already GAIN controls at the VCAs.
>

The MOTM-130 is all designed. It just needs a pcb layout. The "problem" is it has a ZILLION
parts. It's a 30-40hr job. I *haven't had* that block of time available for 5 months.

It *needs* to be done. But it's at least 4 months away.

Paul S.

Paul once  said that the MOTM-1190 (frac VCA) is the core for the MOTM-130. It looks MOTM-130 might be two VCAs rather than two Q111s.

This is an accurate statement. There is a "linking" circuit to do the pan/fading. It's a JH original design. It' 2 1190s + a bit more.

I just have to be careful in my parts selection going forward, with Analog Devices going all obsolete on me :(

Paul S.