PLAN B analog blog

The Model 11 Bandpass Filter has been officially released.  Shipments
to begin in two weeks.  Go here for full module stats, specs and sound
samples:

http://www.ear-group.net/model_11.html

Ok THAT'S pure evil !!!!!!!!!!1:D

so I'll take a plane(I'm in Montréal), fly down to California and set 
a tent in front of Analog Haven's store hehehe

--- In PLAN_B_analog_blog@yahoogroups.com, "(i think you can figure 
that out)" <peter@...> wrote:
>
> The Model 11 Bandpass Filter has been officially released.  Shipments
> to begin in two weeks.  Go here for full module stats, specs and 
sound

> samples:
> 
> http://www.ear-group.net/model_11.html
>

It's interesting, this is the second blog which I've seen this
comparison being drawn.

The similarities to the Buchla 291 go as far as it's vactrol based
bandpass filter, with one of them used as an AGC (Automatic Gain
Control) on the front end.  The circuit I used for that however is
from the Perkin-Elmer Vactrol Application Note #1, not the 291.  

The Model 12 also has an internal AGC, but it's manual, not voltage
controlled.  In that bandwidth was not voltage controlled on the 12
there was no need.  On the Model 12 it's done with a dual pot, one
half controlling the resonance level, the other half controlling the
input gain slightly - much like a fine tune on a VCO. It augments the
gain set by the faceplate's input level pot.  I use a dual pot on
almost every module I make, but for a very different reason: to keep
the main PCBA rigid!  The Model 12 is the only one in which both
halves of the dual pot are active in the circuit.

Back to the AGC for a second ... asking the question what does
variable bandwidth actually do:  it restricts the width of the band
allowed to pass to the outputs obviously and in doing that lets less
frequencies through.  So as the band narrows so does the output level
of the filter.  A circuit is required to boost the output amplitude of
the filter slightly as the band closes down in width - they work
together. This is called an Automatic Gain Control and it's not just a
Plan B thing - these are commonly found in filters. On the ET Bandpass
that gain control is done a bit more efficiently than on the 12.  You
won't find yourself having to make adjustments to the level pot when
you change the resonance or bandwidth las you do on the 12.  On the 11
it's much more set and forget.  I didn't feel it was nessesary as
neither of these functions are voltage controlled.  On the 11 it's
another story - to assure the output gain would stay level as the
Bandwidth was VC'd, I had to come up with a way to adjust the level
accordingly.  The ACG on the 11 is basically a narrow-range vactrol
VCA - a voltage controlled pot - that's governed not to shut down or
open up all the way.  I use the very same circuit for the VC slewing
in the Heisenberg's SMOOTH output.

I went with vac's on the 11 for several reasons, yet did make a
prototype using transconductance amplifiers in place of vac's - four
of them.  I elected to go back to my first choice for a couple of
reasons.  One is cost - although vactrols are bit pricey, there are
much less components required in the drive circuit as on the 13700. 
There is also the cost of PCB real estate one must take into
consideration.  An added benefit of using vacs above the cost
reduction are their sonic fingerprint.  Although these aren't the same
type oused in the Model 13 (not quite as slow), they're still much
slower than trans amps, and I tend to like the whip effect that comes
from that.  It' doesn't 'ring' like the Model 13... whippie is a
better term. Like the tail end of snake, it sort of follows what's
going on in front. Also, the effect gleaned from the TWIN switch is
pretty much nullified using transconductance amps. Each of the two
feedback paths are gated by their own vactrol which are intentionally
running a bit behind one another.  This is what causes the thickness
produced when the switch is tripped.

A recap on the facpelate controls - I actually find the Model 11's
compliment much more similar to the Model 12's than the 291, outside
of the Feedback switch and the voltage controlled Bandwidth.  As in
almost all of the our modules, we used bipolar attenuators.  As with
the Model 12, the 11 as one bipolar control for Freq, and one that's
not.  Both have outputs for the 6dB and 12 dB taps, although handled
differently on each.  Level pots not found on the 291, the feedback
switch not found anywhere, the two tap outputs ot found on the Buchla
filter, etc.

I may have gone into too much detail here, hope you guys find a least
some of it interesting!

- P

--- In PLAN_B_analog_blog@yahoogroups.com, "Romeo Fahl"
<romeo.fahl@...> wrote:
>
> That's thoroughly wicked!
> 
> Say Peter, does this filter have any relation to the Buchla 291? I
see some

> similarities, at least based on the front panel content.
> 
> Romeo
> 
> On 8/29/07, (i think you can figure that out) <peter@...>
> wrote:
> >
> >   The Model 11 Bandpass Filter has been officially released. Shipments
> > to begin in two weeks. Go here for full module stats, specs and sound
> > samples:
> >
> > http://www.ear-group.net/model_11.html
> >
> >  
> >
>

After listening those evil sounds, I wonder, how mellow this can go?

(Curiously, because of words "twin" and "dual", I was expecting a dual 
band pass filter...)

Best regards
Jari Jokinen

It can get really mellow.  Warm?  Well, it's a bandpass and will give
you the usual BP sound - not sure that's warm as compared to a lowpass
- but I will say that without the TWIN mode switched in , with med to
low res and a wider bandwidth, it's very tame and quite BP-sounding. 
The the bandwidth fully open it reacts like a treble knob it's so subtle. 

Personally, I like subtle filtering.  Something that sounds natural
and not 'filtered'. I would not release a filter that didn't do this
and the 11 does. The combination of the Bandwidth and Resonance
controls give you two ways of varying the color.  Much more effective
than merely a res or merely a bandwdth control alone would afford.

If someone wanted a startup system and asked me which filter to get if
they could only swing one - if they did keyboard type work,  if they
were an instrumentalist - I would recommend the 12 only because it
gives you the options of Low, Band, High and Allpass.  If they were
doing more experimental stuff, or the free-er form New Age, anywhere
from Robert Rich, thorugh Steve Roach to Mort Subotnick, that sort of
vibe  where their timbres didn't need to adhere to those commonly
associated with synth parts in pop music or manifest the sound of
acoustic instruments, then I'd recommend the 11 alone.

Now, if someone already had a system and had other filters and wanted one of ours - I would recommend the 11 over the 12 hands down.

Does this make any sense?

When time allows I'll post some sound samples of the 11 behaving itself.

- P

 


--- In PLAN_B_analog_blog@yahoogroups.com, "jalmari3"
<jari.jokinen@...> wrote:

>
> After listening those evil sounds, I wonder, how mellow this can go?
> 
> (Curiously, because of words "twin" and "dual", I was expecting a dual 
> band pass filter...)
> 
> Best regards
> Jari Jokinen
>

Montréal!? Triple LPG??? L'aurais-tu acheté de Zoran?
g.

--- In PLAN_B_analog_blog@yahoogroups.com, "Sylvain Delisle" <sdelisle@...> wrote:

>
> Wait for me, I'll jump in (Montreal too)!  I've just made a nice space
> between my Model 12 and my Triple LPG.
> 
> Nice work Peter, lot's of character in it.
> 
>   -----Message d'origine-----
>   De : PLAN_B_analog_blog@yahoogroups.com
> [mailto:PLAN_B_analog_blog@yahoogroups.com]De la part de gabu_004
>   Envoyé : Wednesday, August 29, 2007 1:17 PM
>   À : PLAN_B_analog_blog@yahoogroups.com
>   Objet : [PLAN_B_analog_blog] Re: Model 11 Evil Twin Filter Released
> 
> 
>   Ok THAT'S pure evil !!!!!!!!!!1:D
> 
>   so I'll take a plane(I'm in Montréal), fly down to California and set
>   a tent in front of Analog Haven's store hehehe
> 
>   --- In PLAN_B_analog_blog@yahoogroups.com, "(i think you can figure
>   that out)" <peter@> wrote:
>   >
>   > The Model 11 Bandpass Filter has been officially released. Shipments
>   > to begin in two weeks. Go here for full module stats, specs and
>   sound
>   > samples:
>   >
>   > http://www.ear-group.net/model_11.html
>   >
> 
> 
> 
>   
> No virus found in this outgoing message.
> Checked by AVG Free Edition.
> Version: 7.5.484 / Virus Database: 269.12.12/979 - Release Date: 8/29/2007
> 8:21 PM
>

Eh oui, de ce cher Zoran!  (back to english so that people can read!) 
I 
think that at least a few people started their modular setup with 
Zoran's sell out.  At least it was my case.  It happened just at the 
right moment: I decided that I was going to start a modular by buying 
a 
Doepfer System 1, and a few days after I see Zoran's ad.  Among the 
stuff I bought, I picked up his Triple LPG and I used it in every 
single patch I made with my modular.  I don't remember ever building 
a 
patch without it.

I've bought a case from Zoran, then a new one form Musiquaire and a 
third one (still empty) from Jonhatan (gesgibraltar2004) who sold his 
studio's Doepfer this summer.

Did you start with Zoran stuff also?  Are you by any chance the guy 
that waited after me to see if I was to take all the A-111?  Or did 
you 
arrived early enough to pick up the Model 15?

--- In PLAN_B_analog_blog@yahoogroups.com, "gabu_004" <gabu_004@...> 
wrote:
>
> Montréal!? Triple LPG??? L'aurais-tu acheté de Zoran?
> g.
> 
> --- In PLAN_B_analog_blog@yahoogroups.com, "Sylvain Delisle" 
<sdelisle@> wrote:
> >
> > Wait for me, I'll jump in (Montreal too)!  I've just made a nice 
space

> > between my Model 12 and my Triple LPG.
> > 
> > Nice work Peter, lot's of character in it.
> >

hehehe effectivement let's switch to english sinon ça ne sera pas long avant d'être fiché 
comme étant des espions LOL!!
Yeah I remember seeing the triple LPG on his system the first time I've got stuff from him 
last January and if I'm not wrong, triple LPG is some type of prototype so it marked my 
mind... and yes indeed I'm the guy who waited to see if you took the second A-111...and 
also who bought one of the two M15, I wanted to get the M12 too but there was no 
feedback switch on it. 
I also got a case and maybe half of the modules I own from him too, I remember asking 
me if I knew someone called Sylvain after you've got your system from him, I guess there 
is only a few of us in Montréal belonging in that "cult" actually LOL!
so yeah nice meeting you :D on va surement se croiser un de ces 4...


--- In PLAN_B_analog_blog@yahoogroups.com, "Sylvain Delisle" <sdelisle@...> wrote:

>
> Eh oui, de ce cher Zoran!  (back to english so that people can read!) 
> I 
> think that at least a few people started their modular setup with 
> Zoran's sell out.  At least it was my case.  It happened just at the 
> right moment: I decided that I was going to start a modular by buying 
> a 
> Doepfer System 1, and a few days after I see Zoran's ad.  Among the 
> stuff I bought, I picked up his Triple LPG and I used it in every 
> single patch I made with my modular.  I don't remember ever building 
> a 
> patch without it.
> 
> I've bought a case from Zoran, then a new one form Musiquaire and a 
> third one (still empty) from Jonhatan (gesgibraltar2004) who sold his 
> studio's Doepfer this summer.
> 
> Did you start with Zoran stuff also?  Are you by any chance the guy 
> that waited after me to see if I was to take all the A-111?  Or did 
> you 
> arrived early enough to pick up the Model 15?
> 
> --- In PLAN_B_analog_blog@yahoogroups.com, "gabu_004" <gabu_004@> 
> wrote:
> >
> > Montréal!? Triple LPG??? L'aurais-tu acheté de Zoran?
> > g.
> > 
> > --- In PLAN_B_analog_blog@yahoogroups.com, "Sylvain Delisle" 
> <sdelisle@> wrote:
> > >
> > > Wait for me, I'll jump in (Montreal too)!  I've just made a nice 
> space
> > > between my Model 12 and my Triple LPG.
> > > 
> > > Nice work Peter, lot's of character in it.
> > >
>

That Triple LPG is actually the same circuit as the Rev. 1 Dual
Timbral Gate.  There have been some changes made to it since but it is
different than the Buchla circuit in design, but extremely close
sonically. The faceplates were made for John Frusciante, I had  few
left over and made I think three others like John's, one for Zoran. I
made a quad version of the faceplate as well -  one was made for frac
format for Gino Robair, the other for a customer here in LA. The same
boards were used in the two Serge panels I made in Serge format - one
for John Duvals Fist of God which was just sold this week and anorher
for Dennis in the Netherlands which he also sold when he offloaded the
whole Serge system.  The boards were design by Ken Stone - this is
before I did them myself and were actually made for my own use
initially, although I've given all of those to ex-employees.

Ah...those were the days... when I had time to actually work on music!

- P



--- In PLAN_B_analog_blog@yahoogroups.com, "gabu_004" <gabu_004@...>
wrote:
>
> hehehe effectivement let's switch to english sinon �a ne sera pas
long avant d'�tre fich� 
> comme �tant des espions LOL!!
> Yeah I remember seeing the triple LPG on his system the first time
I've got stuff from him 
> last January and if I'm not wrong, triple LPG is some type of
prototype so it marked my 
> mind... and yes indeed I'm the guy who waited to see if you took the
second A-111...and 
> also who bought one of the two M15, I wanted to get the M12 too but
there was no 
> feedback switch on it. 
> I also got a case and maybe half of the modules I own from him too,
I remember asking 
> me if I knew someone called Sylvain after you've got your system
from him, I guess there 
> is only a few of us in Montr�al belonging in that "cult" actually LOL!
> so yeah nice meeting you :D on va surement se croiser un de ces 4...
> 
> 
> --- In PLAN_B_analog_blog@yahoogroups.com, "Sylvain Delisle"
<sdelisle@> wrote:

> >
> > Eh oui, de ce cher Zoran!  (back to english so that people can read!) 
> > I 
> > think that at least a few people started their modular setup with 
> > Zoran's sell out.  At least it was my case.  It happened just at the 
> > right moment: I decided that I was going to start a modular by buying 
> > a 
> > Doepfer System 1, and a few days after I see Zoran's ad.  Among the 
> > stuff I bought, I picked up his Triple LPG and I used it in every 
> > single patch I made with my modular.  I don't remember ever building 
> > a 
> > patch without it.
> > 
> > I've bought a case from Zoran, then a new one form Musiquaire and a 
> > third one (still empty) from Jonhatan (gesgibraltar2004) who sold his 
> > studio's Doepfer this summer.
> > 
> > Did you start with Zoran stuff also?  Are you by any chance the guy 
> > that waited after me to see if I was to take all the A-111?  Or did 
> > you 
> > arrived early enough to pick up the Model 15?
> > 
> > --- In PLAN_B_analog_blog@yahoogroups.com, "gabu_004" <gabu_004@> 
> > wrote:
> > >
> > > Montr�al!? Triple LPG??? L'aurais-tu achet� de Zoran?
> > > g.
> > > 
> > > --- In PLAN_B_analog_blog@yahoogroups.com, "Sylvain Delisle" 
> > <sdelisle@> wrote:
> > > >
> > > > Wait for me, I'll jump in (Montreal too)!  I've just made a nice 
> > space
> > > > between my Model 12 and my Triple LPG.
> > > > 
> > > > Nice work Peter, lot's of character in it.
> > > >
> >
>

So, if I'm correct you also happen to be in a band of some sort with 
a guy working in Archambault's synths section.  Right?

It's good to know at least one other eurorack modular user in the 
area.  Easier if we ever feel the need to sell or trade modules.

For the Model 12, it didn't have the switch, but Peter is providing 
the steps to make the modification.  And probably that I'll 
experiment a bit with that making it maybe a three way switch with 
different resistor path, or a pot.  When I get the time, that is...


--- In PLAN_B_analog_blog@yahoogroups.com, "gabu_004" <gabu_004@...> 
wrote:
>
> hehehe effectivement let's switch to english sinon ça ne sera pas 
long avant d'être fiché 
> comme étant des espions LOL!!
> Yeah I remember seeing the triple LPG on his system the first time 
I've got stuff from him 
> last January and if I'm not wrong, triple LPG is some type of 
prototype so it marked my 
> mind... and yes indeed I'm the guy who waited to see if you took 
the second A-111...and 
> also who bought one of the two M15, I wanted to get the M12 too but 
there was no 
> feedback switch on it. 
> I also got a case and maybe half of the modules I own from him too, 
I remember asking 
> me if I knew someone called Sylvain after you've got your system 
from him, I guess there 
> is only a few of us in Montréal belonging in that "cult" actually 
LOL!
> so yeah nice meeting you :D on va surement se croiser un de ces 4...
> 
> 
> --- In PLAN_B_analog_blog@yahoogroups.com, "Sylvain Delisle" 
<sdelisle@> wrote:
> >
> > Eh oui, de ce cher Zoran!  (back to english so that people can 
read!) 
> > I 
> > think that at least a few people started their modular setup with 
> > Zoran's sell out.  At least it was my case.  It happened just at 
the 
> > right moment: I decided that I was going to start a modular by 
buying 
> > a 
> > Doepfer System 1, and a few days after I see Zoran's ad.  Among 
the 
> > stuff I bought, I picked up his Triple LPG and I used it in every 
> > single patch I made with my modular.  I don't remember ever 
building 
> > a 
> > patch without it.
> > 
> > I've bought a case from Zoran, then a new one form Musiquaire and 
a 
> > third one (still empty) from Jonhatan (gesgibraltar2004) who sold 
his 
> > studio's Doepfer this summer.
> > 
> > Did you start with Zoran stuff also?  Are you by any chance the 
guy 
> > that waited after me to see if I was to take all the A-111?  Or 
did 

> > you 
> > arrived early enough to pick up the Model 15?
> >

HAHAHAHA Montréal is such a small town when it comes to music!!!!!! 
Yeah indeed Mikael from Archambeault's synth section is playing synth
(NordModular G2) in my band...Do you know him? We're trying actually 
to incorporate the Modular system live (to replace some pre-recorded 
seq)without making it a total nightmare hehehehe you know what I 
mean!
For sure I'll let you know when we perform or if I have modules to 
sell or trade! 

--- In PLAN_B_analog_blog@yahoogroups.com, "Sylvain Delisle" 
<sdelisle@...> wrote:
>
> So, if I'm correct you also happen to be in a band of some sort 
with 
> a guy working in Archambault's synths section.  Right?
> 
> It's good to know at least one other eurorack modular user in the 
> area.  Easier if we ever feel the need to sell or trade modules.
> 
> For the Model 12, it didn't have the switch, but Peter is 
providing 
> the steps to make the modification.  And probably that I'll 
> experiment a bit with that making it maybe a three way switch with 
> different resistor path, or a pot.  When I get the time, that is...
> 
> 
> --- In PLAN_B_analog_blog@yahoogroups.com, "gabu_004" <gabu_004@> 
> wrote:
> >
> > hehehe effectivement let's switch to english sinon ça ne sera 
pas 
> long avant d'être fiché 
> > comme étant des espions LOL!!
> > Yeah I remember seeing the triple LPG on his system the first 
time 
> I've got stuff from him 
> > last January and if I'm not wrong, triple LPG is some type of 
> prototype so it marked my 
> > mind... and yes indeed I'm the guy who waited to see if you took 
> the second A-111...and 
> > also who bought one of the two M15, I wanted to get the M12 too 
but 
> there was no 
> > feedback switch on it. 
> > I also got a case and maybe half of the modules I own from him 
too, 
> I remember asking 
> > me if I knew someone called Sylvain after you've got your system 
> from him, I guess there 
> > is only a few of us in Montréal belonging in that "cult" 
actually 
> LOL!
> > so yeah nice meeting you :D on va surement se croiser un de ces 
4...
> > 
> > 
> > --- In PLAN_B_analog_blog@yahoogroups.com, "Sylvain Delisle" 
> <sdelisle@> wrote:
> > >
> > > Eh oui, de ce cher Zoran!  (back to english so that people can 
> read!) 
> > > I 
> > > think that at least a few people started their modular setup 
with 
> > > Zoran's sell out.  At least it was my case.  It happened just 
at 
> the 
> > > right moment: I decided that I was going to start a modular by 
> buying 
> > > a 
> > > Doepfer System 1, and a few days after I see Zoran's ad.  
Among 
> the 
> > > stuff I bought, I picked up his Triple LPG and I used it in 
every 
> > > single patch I made with my modular.  I don't remember ever 
> building 
> > > a 
> > > patch without it.
> > > 
> > > I've bought a case from Zoran, then a new one form Musiquaire 
and 
> a 
> > > third one (still empty) from Jonhatan (gesgibraltar2004) who 
sold 
> his 
> > > studio's Doepfer this summer.
> > > 
> > > Did you start with Zoran stuff also?  Are you by any chance 
the 
> guy 
> > > that waited after me to see if I was to take all the A-111?  
Or 

> did 
> > > you 
> > > arrived early enough to pick up the Model 15?
> > >
>

mmmm that,s interesting... I like how you seem to make custom stuff based on orders 
from customers, makes that whole thing like family type of atmosphere...you know what I 
mean?
so yeah I can't wait to get a hand on the M11... so I can wreck my professors ears LOL (no 
no no, I'm just kidding, they're actually really nice and passionnated people hehehe)

g.

--- In PLAN_B_analog_blog@yahoogroups.com, "(i think you can figure that out)" 
<peter@...> wrote:

>
> That Triple LPG is actually the same circuit as the Rev. 1 Dual
> Timbral Gate.  There have been some changes made to it since but it is
> different than the Buchla circuit in design, but extremely close
> sonically. The faceplates were made for John Frusciante, I had  few
> left over and made I think three others like John's, one for Zoran. I
> made a quad version of the faceplate as well -  one was made for frac
> format for Gino Robair, the other for a customer here in LA. The same
> boards were used in the two Serge panels I made in Serge format - one
> for John Duvals Fist of God which was just sold this week and anorher
> for Dennis in the Netherlands which he also sold when he offloaded the
> whole Serge system.  The boards were design by Ken Stone - this is
> before I did them myself and were actually made for my own use
> initially, although I've given all of those to ex-employees.
> 
> Ah...those were the days... when I had time to actually work on music!
> 
> - P
> 
> 
> 
> --- In PLAN_B_analog_blog@yahoogroups.com, "gabu_004" <gabu_004@>
> wrote:
> >
> > hehehe effectivement let's switch to english sinon �a ne sera pas
> long avant d'�tre fich� 
> > comme �tant des espions LOL!!
> > Yeah I remember seeing the triple LPG on his system the first time
> I've got stuff from him 
> > last January and if I'm not wrong, triple LPG is some type of
> prototype so it marked my 
> > mind... and yes indeed I'm the guy who waited to see if you took the
> second A-111...and 
> > also who bought one of the two M15, I wanted to get the M12 too but
> there was no 
> > feedback switch on it. 
> > I also got a case and maybe half of the modules I own from him too,
> I remember asking 
> > me if I knew someone called Sylvain after you've got your system
> from him, I guess there 
> > is only a few of us in Montr�al belonging in that "cult" actually LOL!
> > so yeah nice meeting you :D on va surement se croiser un de ces 4...
> > 
> > 
> > --- In PLAN_B_analog_blog@yahoogroups.com, "Sylvain Delisle"
> <sdelisle@> wrote:
> > >
> > > Eh oui, de ce cher Zoran!  (back to english so that people can read!) 
> > > I 
> > > think that at least a few people started their modular setup with 
> > > Zoran's sell out.  At least it was my case.  It happened just at the 
> > > right moment: I decided that I was going to start a modular by buying 
> > > a 
> > > Doepfer System 1, and a few days after I see Zoran's ad.  Among the 
> > > stuff I bought, I picked up his Triple LPG and I used it in every 
> > > single patch I made with my modular.  I don't remember ever building 
> > > a 
> > > patch without it.
> > > 
> > > I've bought a case from Zoran, then a new one form Musiquaire and a 
> > > third one (still empty) from Jonhatan (gesgibraltar2004) who sold his 
> > > studio's Doepfer this summer.
> > > 
> > > Did you start with Zoran stuff also?  Are you by any chance the guy 
> > > that waited after me to see if I was to take all the A-111?  Or did 
> > > you 
> > > arrived early enough to pick up the Model 15?
> > > 
> > > --- In PLAN_B_analog_blog@yahoogroups.com, "gabu_004" <gabu_004@> 
> > > wrote:
> > > >
> > > > Montr�al!? Triple LPG??? L'aurais-tu achet� de Zoran?
> > > > g.
> > > > 
> > > > --- In PLAN_B_analog_blog@yahoogroups.com, "Sylvain Delisle" 
> > > <sdelisle@> wrote:
> > > > >
> > > > > Wait for me, I'll jump in (Montreal too)!  I've just made a nice 
> > > space
> > > > > between my Model 12 and my Triple LPG.
> > > > > 
> > > > > Nice work Peter, lot's of character in it.
> > > > >
> > >
> >
>