MOTM

hello all,

well i got the mc202, it turns out i even know a bloke with a manual - so
happy all round (apart from now having to build a load of cables with those
nasty dins on the end)

anyway, next xmas question:
after spending an alarming portion (ie more than zero ;-) of my time down
the back of 19" racks, i came to another interesting conclusion - it would
be dead simple to hotwire my Juno Six to send & recieve gate & CV
information
anyone any hot tips before i spend \ufffd20 on a badly photocopied service
manual..?
or am i barking up the wrong tree (or just barking - or just a tree - or,
or...)
sorry for being off topic (well it is kind of 'on' cos this will be my
master keyboard if it works)

cheers
paul b

In a message dated 12/29/99 1:19:13 PM, vulture.squadron@... writes:

>anyway, next xmas question:
>after spending an alarming portion (ie more than zero ;-) of my time down
>the back of 19" racks, i came to another interesting conclusion - it would
>be dead simple to hotwire my Juno Six to send & recieve gate & CV
>information
>anyone any hot tips before i spend \ufffd20 on a badly photocopied service
>manual..?

I wish I had some hot tips here! Many years ago a friend loaned me her Juno 
6, and I still have it, in fact i was just poking around inside it a few days 
ago trying in vain to fix a broken switch (the KEY TRANSPOSE button). I 
didn't look at the feasibility of CV outputs and I see why you might think it 
would be easy (if the VCFs really are voltage controlled), but I'm wondering 
what you're thinking about given the polyphonic nature of the keyboard. So 
please post to the list (or at least me) anything you figure out regarding 
this -- and if your manual has the part number for those Alps buttons, I'd 
really like to know since that would make ordering a bit easier I'd hope.

BTW, I seem to recall that Juergen Habile has some Juno 6 mods on his page at 
synthfool -- I've never looked at them, I guess I should.
JB

hello,

>I wish I had some hot tips here! Many years ago a friend loaned me her Juno
>6, and I still have it, in fact i was just poking around inside it a few
days
>ago trying in vain to fix a broken switch (the KEY TRANSPOSE button). I
>didn't look at the feasibility of CV outputs and I see why you might think
it
>would be easy (if the VCFs really are voltage controlled), but I'm
wondering
>what you're thinking about given the polyphonic nature of the keyboard.

what is this strange magic you call p-o-l-y-f-o-n-i-c..?
half the fun i have with polyphonic sources & monophonic synths, is getting
the whole thing to trip over itself by gradually introducing polyphony
anyway, i was kind of encouraged by the stark unconnected molexes in the
centre of the bottom board marked "env" and "gate".
by the way, the VCF sync's to my #320 like a dream, another good sign..?

>BTW, I seem to recall that Juergen Habile has some Juno 6 mods on his page
at
>synthfool -- I've never looked at them, I guess I should.


been there - not working. i also tried a search on variations of "juno 6
mod" - no banana...
more info when i find some
cheers
paul b

Just when you thought that Hendry was good for nothing but being a
stooge....

I have in my hands the service manual for the Juno 60 (6 with memory).
The key transpose switch is listed as follows:

Switch SUT11A-1 (13129321)  that is a momentary switch.
The colored button on top actually has a separate number:
016H036 gets you the white one (that's the color of my key transpose
button).

Now, concerning the original question, the DCOs are CPU controlled as it
looks to me.  However, the VCFs do appear to be actually voltage controlled
to me.  Looks like IC47 (14051B) is the VCF Demux.  I am not real sharp on
this stuff, but this thing is full of Mux and DeMux.  Most of the voltages
seem to available at those points (at least this is how the Juno 60 works. 
I think the Juno 6 is identical except it has no patch memory and has no
digital interface (DCB).

Larry (not always a dumb stooge) Hendry


----------
In a message dated 12/29/99 1:19:13 PM, vulture.squadron@... writes:
anyway, next xmas question: 
after spending an alarming portion (ie more than zero ;-)
of my time down the back of 19" racks, i came to another
interesting conclusion - it would be dead simple to hotwire
my Juno Six to send & recieve gate & CV information
anyone any hot tips before i spend \ufffd20 on a badly 
photocopied service manual..?
-----------

From: JWBarlow@...
I wish I had some hot tips here! Many years ago a friend loaned
me her Juno 6, and I still have it, in fact i was just poking around
inside it a few days ago trying in vain to fix a broken switch 
(the KEY TRANSPOSE button). I didn't look at the feasibility
of CV outputs and I see why you might think it would be easy
(if the VCFs really are voltage controlled), but I'm wondering 
what you're thinking about given the polyphonic nature of the
keyboard. So please post to the list (or at least me) anything
you figure out regarding this -- and if your manual has the part
number for those Alps buttons, I'd really like to know since
that would make ordering a bit easier I'd hope.

> From: Paul & Alleyne <vulture.squadron@...>
> by the way, the VCF sync's to my #320 like a dream, another good sign..?

Care to elaborate ??

LH

>From: "J. Larry Hendry" <jlarryh@...>
>
>> From: Paul & Alleyne <vulture.squadron@...>
>> by the way, the VCF sync's to my #320 like a dream, another good sign..?
>
>Care to elaborate ??
>
hello
a nice early one today (snoring girlfriend / hungry cats)
anyway
don't know about the juno 60, but the juno 6 has an input marked "vcf
control" - i've never really mucked around with this, so i thought i'd put a
#320 output into "vcf control" and the #420 at the same time so see if they
sync'd - which indeed they do

cheers
paul b

> From: "Paul & Alleyne" <vulture.squadron@...>
> don't know about the juno 60, but the juno 6 has an input marked "vcf
> control" - i've never really mucked around with this, so i thought i'd
put a
> #320 output into "vcf control" and the #420 at the same time so see if
they
> sync'd - which indeed they do

Yep.  The Juno 60 is the same.  Looks like I need to do more playing around
<grin>
Larry

In a message dated 12/30/99 12:10:52 AM, vulture.squadron@... writes:

>don't know about the juno 60, but the juno 6 has an input marked "vcf
>control" - i've never really mucked around with this, so i thought i'd
>put a
>#320 output into "vcf control" and the #420 at the same time so see if
>they
>sync'd - which indeed they do

I had thought about doing something like this but I'd imagined (correctly as 
it turns out) that the VCF CONTROL input on the back was most probably 
designed for use with some kind of pedal. So I checked the voltage across the 
tip and the sleeve of this jack and found almost 11 volts at the tip 
(assuming 1v/octave this seems reasonable -- maybe there is hope for using 
this as an analog keyboard). I'm thinking that "it wants" to see a pot 
between the tip and sleeve -- to summarize: I'd resist the temptation to plug 
in a MOTM (or any other voltage source) into this input. Maybe when Paul (or 
the other techs on the list) can clear this up.

Considering this uses the 4051 as a VCF demux, I'm guessing that this is 8 
note polyphonic (there are easier ways to figure this out), and one could 
"easily" get low or high note priority by picking off one of the pins of the 
4051.

And thanks for the switch number Larry! While it seems like it might be a 
momentary switch, if you depress it once it will both stay down and set a 
flip flop (which triggers the KEY TRANSPOSE function). Depress it again, and 
it goes up and resets the flip flop (deactivating the KEY TRANSPOSE 
function). Unfortunately, when I depress this button, it will set the FF, but 
won't stay down so I can't reset the FF unless I turn off the power -- 
depressing!

JB

> From: JWBarlow@...
> Considering this uses the 4051 as a VCF demux, I'm guessing that this is
8 
> note polyphonic (there are easier ways to figure this out), and one could

> "easily" get low or high note priority by picking off one of the pins of
the 
> 4051.

6 voice poly.  However, I think if you are playing only one note, it
rotates through the voices.  So, if you had one voice out, it would play 5
notes and then miss one.  Maybe I'm wrong.
 
> And thanks for the switch number Larry! While it seems like it might be a

> momentary switch, if you depress it once it will both stay down and set a

> flip flop (which triggers the KEY TRANSPOSE function). Depress it again,
and 
> it goes up and resets the flip flop (deactivating the KEY TRANSPOSE 
> function). Unfortunately, when I depress this button, it will set the FF,
but 
> won't stay down so I can't reset the FF unless I turn off the power -- 
> depressing!

This is supposed to be a momentary switch.  The way that key transpose
works on the 60 is that you press and hold that key down while you press an
appropriate key on the keyboard for transpose.  If the 6 is different, I
will be surprised.  If so, I owe you a different number.  There is a
different switch number for the press on / press off like the adjacent
"hold" button.

LH