MOTM

Hello,

I am building a MOTM system for not only analogue synthesis but also
to process other synths and acoustic sources. The Synthesizers.com
module looks like a great idea to generate a gate signal from an audio
source to control an EG for a MOTM filter. Is it effective?

Or should I use a Midi signal to trigger a gate generated by a Midi to
CV converter?

The midi triggering concerns me a little due to possible latency issues. 

Thanks

On the topic of trig/gate extraction - for an instrument like a guitar, 
does the gate drop when a new note is picked before the last one has 
rung out on typical envelope gate extractors?  I was guessing no, and in 
order to get a retrigger you'd have to use some sort of differentiator 
on the raw envelope to extract triggers.

Thoughts?

Dave Moylan

chad_kettering wrote:

>Hello,
>
>I am building a MOTM system for not only analogue synthesis but also
>to process other synths and acoustic sources. The Synthesizers.com
>module looks like a great idea to generate a gate signal from an audio
>source to control an EG for a MOTM filter. Is it effective?
>
>Or should I use a Midi signal to trigger a gate generated by a Midi to
>CV converter?
>
>The midi triggering concerns me a little due to possible latency issues. 
>
>Thanks
>
>
>
>
>
>
>
> 
>Yahoo! Groups Links
>
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>  
>

Quoting "J. Larry Hendry" <jlarryh@...>:

> > -----Original Message-----
> > From: Michael Zacherl <egroups@...>
> >
> > So you join the wing/s and the existing (main?) cabinet?
>
> No, they will just sit side by side.  But, the cabinet shape 
> will be such that they "nest," The angle of use is predetermined 
> as the cabinet side will not be straight.

What's the angle you want to have between the two cabinets?

> > AFAIK the System 700 cabinets were just stacked and stood next 
> > to each other.
> 
> You are correct.  Here are several photos of a system 700 for about 
> 3 years ago at AHMW.
> http://www.wiseguysynth.com/larry/ahmw2002/ahmw2002.htm
 
> > How will you transport your system?
> 
> The same way I do now:  carefully and infrequently.  But, the wing 
> cabinets will be the smallest.  So, the moving difficulty is not 
> worsened.  The big 2 row slant cabinet is the worst to move today.
> This is not a gigging tool for me.  My cabinets would certainly be 
> different for that.

Small like 12U wide or so?

> > I'm looking forward to see your documentary on your site ;-)
> 
> OK, it will be there, eventually.

 :-) Michael.

Quoting "J. Larry Hendry" <jlarryh@...>:
> > From: Michael Zacherl <egroups@...>
> > What's the angle you want to have between the two cabinets?
> I measured / calculated 42 degrees as what I wanted.  I am going to
> build a mock up with cheap chip board at 45 degrees and see how I 
> like it.
 
Yeah, mockups are a good thing! A friend gave me an old vat (?) made
of chip board. Originally used for flower pots he cut it down to house
some modules before his real cabinet was ready.
Now I got it and I'm happy because I can "practice" all the "delicate"
stuff like PSU mounting, flat rails (which come quite handy since the
old boards tend to splinter easily) etc.
It's pretty ugly but very helpful. And it gives me a good chance to
adjust my ideas of the final cabinets.
It's sort of a prototype stage if you want ;-)

> The bottom cabinets will have all the angles.  On top of those 
> (same width) will sit 12U high, 19" wide rack cabinets.  In those
> cabinets I will be able to mix MOTM modules on rack rails with rack
> mount gear like my Kenton pro-2000 and more.  I will not know the
> exact ability of the bottom cabinets for module space until I get
> the prototype built.  Some adjustment to my plans is anticipated as
> I work through details.

How many single row top cabinets you have got meanwhile on your main
cabinet?
Two or three? 2 row slanted + Magic Bus is a bit lower than 10U I guess.
So with 12U on top of the wings you're at about the same height?
I'm getting dizzy!  ;-)
 
> Re gigging cabinets:
> > Small like 12U wide or so?
> 
> Sure.  Something about the size of the dot com portable cabinets.
> But, gigging and modular do not mix for me.  I'll leave that to
> those with significantly more patching talent.

hehe - but with a system big like your's lack of some patching talent
could be compensated with shipping talent  ;-)))

seriously - I really do admire people like Robert Rich and all others
who manage to _play_ a modular system live in a way that it's more
than just stage decoration.

   cheers, Michael.

> -----Original Message-----
> From: tontaub [mailto:egroups@...]
> Yeah, mockups are a good thing!

I don't know how else to do it.  There is a compound angle on the lower
cabinet.  I got dizzy with my calculator.  And, trying to explain it without
hard numbers to the cabinet maker was impossible.

> How many single row top cabinets you have got meanwhile on your main
cabinet? Two or three? 2 row slanted + Magic Bus is a bit lower than 10U I
guess. So with 12U on top of the wings you're at about the same height? I'm
getting dizzy!  ;-)  Plus, I get to experiment with the ergonomics.

Two of them. Some of the AHMW 2004 photos show three.  But, the third
temporary.  The cabinet was borrowed since I have been out of room in my
cabinets for some time. The bottom wing cabinets will be exactly like the
lower cabinet in height.  2 rows plus shorter (length) magic buss (TM) and
the stadium corner inverted triangle.  The top cabinets will be a 12 U high
rack size cabinet which will equal the height of the existing TWO 1 row
cabinets.  The goal is to have all the height the same.

> seriously - I really do admire people like Robert Rich and all others who
manage to _play_ a modular system live in a way that it's more than just
stage decoration.

You and me both. :-)
Larry

Hey Chad!

I built a dual version of a trigger generator designed by Mark Media 
et al., from Stooge Larry's website - 
http://www.wiseguysynth.com/larry/users/mark1/trigger.htm -and it 
works very well.

This circuit uses a DV/DT comparator followed by a one shot timer.  
Any change in voltage amplitude over a change in time (delta 
voltage/delta time) makes the comparator output go high.  The 
comparator is actually producing a negative going trigger to fire the 
555 timer in one shot mode.  The output is a short, positive going 
pulse which works nicely with any trigger input.

What's great about this circuit is that it will work with ANY 
waveform at the input.  Sine, triangle, square or totally wack 
complex and high or low frequency - it doesn't matter!  I use it to 
send triggers to my EG's in place of an envelope follower, creating 
separate notes from otherwise continous modulated signals.  For 
example, modulate the pitch of an oscillator with a sample and hold 
and send the oscillator output to the trigger generator.  Send the 
oscillator throughput to a filter and the trigger out to the EG which 
modulates the filter.  Every time the sample and hold changes the 
oscillator pitch, the EG/filter shapes the note timbre.

Simple and effective, but it may not be "tight" enough for guitar.  
Much will depend on the attack of the instrument.  I'll plug a 
guitar/preamp combination into it and let you know what happens.  I 
can assure you, though, it works very well in any synth application 
I've been able to dream up!

Chub

ps- I've got the pcb layout for my dual version around here 
somewhere... 

--- In motm@yahoogroups.com, "chad_kettering" <chad_kettering@y...> 
wrote:
> 
> Hello,
> 
> I am building a MOTM system for not only analogue synthesis but also
> to process other synths and acoustic sources. The Synthesizers.com
> module looks like a great idea to generate a gate signal from an 
audio
> source to control an EG for a MOTM filter. Is it effective?
> 
> Or should I use a Midi signal to trigger a gate generated by a Midi 
to
> CV converter?
> 
> The midi triggering concerns me a little due to possible latency 
issues. 
> 
> Thanks

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

From: charlesosthelder [mailto:osthelder@...]
I built a dual version of a trigger generator designed by Mark Media 
et al., from Stooge Larry's website - 
http://www.wiseguysynth.com/larry/users/mark1/trigger.htm -and it 
works very well.

<snip>

ps- I've got the pcb layout for my dual version around here 
somewhere... 

I'll be happy to post any layout files you want to share.
Larry