MOTM

>From: DAVEVOSH@...
><<
> I'm not clear on what musical use I'd put an envelope that's biased so
that
> sustain is 0V though - can you enlighten me?
>
>dave,
>try it out on a vcf - bias your env. output to start below 0vdc.. can also
>give some interesting pitch attack envelopes when hooked in to a vco and
>mixed in in small quantities.
>best,
>dave
>
hello all,
this bias thing is very interesting (and i thought i'd managed a quite
respectable stroll up the learning curve) especially the Koto envelope
application posted the other day (thank you - i forgot who it was tho)
not having a biased EG, i assume with a bit of tweaking, i could put an
inverter with offset over the MOTM EG to simulate this..? however i've yet
to build an inverter (any minute now tho), and it probably not work anyway -
does anyone else have this problem or is it "just a phase i'm going through"
i can fix midi-port on an OB8, i can trace & repair nasty 1k plus point
patch bays, i can build MOTM kits with my eyes close - but  i just cannot
string together a six component circuit from scratch
anyway - we'll see in a minute, yesterday's frequency doubler (seven parts)
didn't work, and so today's envelope follower with exponential lag &
inverter has been cancelled in favour of an inverter, and an exponential
lag - lets hope at least one of them works...

and by the way Paul S (FoMoaM) - what what that cryptic comment about the
MS20 envelope follower..? I've got an MS-03 which i assume is the same
circuit but with a few frills (like tunable 1v/Oct and proper gate output) -
is there something i should know..? (well apart from it's crap)

cheers
paul b

In a message dated 00-02-05 06:21:15 EST, you write:

<< Koto envelope
 application posted the other day (thank you - i forgot who it was tho)
 not having a biased EG, i assume with a bit of tweaking, i could put an
 inverter with offset over the MOTM EG to simulate this..?  >>



paul,
if i recall correctly the koto idea was courtesy of ken tracs.
as for biasing, the invertor and offset will work. reversible attenuator cv 
inputs on a module will also get the job done. or a simple "bias supply" ( 
jacks providing a fixed +5 and -5 vdc ) and cv mixer will do. not hard to 
achieve and very useful.
best,
dave

>From: DAVEVOSH@...
>paul,
>if i recall correctly the koto idea was courtesy of ken tracs.
>as for biasing, the invertor and offset will work. reversible attenuator cv
>inputs on a module will also get the job done. or a simple "bias supply"

>jacks providing a fixed +5 and -5 vdc ) and cv mixer will do. not hard to
>achieve and very useful.


thanks, but the update stands at "not hard to do at all projects" - 3 /
paul - nil. another two 4 component modules have totally beaten me - i think
i must be having a bad weekend
although to be honest, the inverter might work - i just need to test it
properly

cheers
paul b

In a message dated 2/5/2000 12:12:36 PM, vulture.squadron@... writes:

>thanks, but the update stands at "not hard to do at all projects" - 3 /
>paul - nil. another two 4 component modules have totally beaten me - i
>think
>i must be having a bad weekend
>although to be honest, the inverter might work - i just need to test it
>properly

Let me commiserate with you Paul. I've built a lot of small circuits, but 
recently I've tried to clone the MOTM 800 circuit (a standard MOTM PCB won't 
fit in the application I'm building). It looked like a reasonable project, 
but after assembling it on a breadboard, I haven't been able to get the 
attack to work properly at all! I spent an embarrassing number of hours with 
no luck. While it's fun to throw a simple mixer together, I'm really glad 
MOTM kits are easy to build and their quality is so high.

Just found my MOTM 320 in the mail! Preparing to start building so can catch 
up with the MOTM fun!
JB

In a message dated 00-02-05 14:12:31 EST, you write:

<< hanks, but the update stands at "not hard to do at all projects" - 3 /
 paul - nil. another two 4 component modules have totally beaten me - i think
 i must be having a bad weekend >>



paul,
here, i have to sympathise........i`m the worlds worst builder and have 
largely given it up in lieu of getting assembled stuff. downside - things 
cost more and there are some neat things/ideas out there that i seriously 
doubt anyone will ever offer as commercial modules. total bummer. still, what 
can`t be cured must be endured........... (or, i`ve got to get myself back 
together and "into" building again)
best,
dave

Hi All !

As this came up again, i checked my downloaded schematics, and found 
the MS20 ones, downloaded dec97, so no URL :) (anyone ?)

Surely enough, this has the same characteristics as the MS50, but the 
normal out goes to the VCA (no ext out) .  The "sustain at 0v" one 
goes to the filter (no ext out either), and the inverse of this is on 
the patch panel .  Circuitry is simple enough, two opamps (4558) and 
8 resistors (plus PS decoupling, i suppose) .  It's on the 
ms20_pg4.gif in the 885kb .zip, bottom left .

When plugging in such an env, one is guaranteed that the sustain will 
not affect the sound of the patch, as it is a 0V .  With the sustain 
knob at 0 one gets a positive AD envelope, no release .  Sustain at 
10 gives an ASR envelope, only subtracting something from the set 
point .  When modulating the filter cutoff, for ex, this means one 
does not have to touch the freq when increasing the mod amount to get 
back to the same sustained sound .  And this is even more important 
on pitch, no retuning here .  Very useful, as i said .

Bye for now .


Keep 'em oscillating :)


Hugo
=

At 11:16 AM 02/05/2000 -0000, "Paul & Alleyne" <vulture.squadron@...>
wrote:
>and by the way Paul S (FoMoaM) - what what that cryptic comment about the
>MS20 envelope follower..? I've got an MS-03 which i assume is the same
>circuit but with a few frills (like tunable 1v/Oct and proper gate output) -
>is there something i should know..? (well apart from it's crap)

I brought up the MS-20 external signal processor (envelope follower PLUS
pitch->CV converter) in response to the upcoming MOTM envelope follower
(which, Paul said, doesn't have a pitch->CV converter, but yeah, he did
make some sort of cryptic remark w/respect to the V/Hz->V/oct compatability
issue).  I have both an MS-20 and MS-03 and they are not at all the same
circuit (or at least they operate completely differently).  I agree that
the MS-03 is pretty crappy (I wouldn't bother to buy a clone of that), but
I've had considerable success (no, it won't track speedmetal guitar licks,
but it works great for adding synth to a pulsing bass guitar sound or a
droning violin/flute/voice or for "Baba O'Riley"-type "random arpegiation"
from processing guitar chords) with the MS-20 external signal processor and
would love to have one in a standalone box.  Perhaps I should just do it
myself, since it's a pretty simple circuit ... I'll just need to build a
V/Hz->V/oct converter into it ...

	-Doug
	 ceres@...