[sdiy] midi clock

[harrybissell]

Hi Rude...

Watch out for grounding. Some midi inputs and outputs do not handle the grounds
properly.  There should NOT be a ground between units established by the
MIDI cable. I had this on a unit that would only work at the end of the midi
chain, not the middle (the thru was not 'ungrounded' properly)

Early MIDI cables often had only two conductors... modern ones have all five.
The normally unused ground pin might be a problem... or possible some
non-standard uses of the additional lines (I think some drum machines did sync
on these ???)

H^) harry

Rude 66 wrote:

> aha.. that would explain some things. but would that also explain why it
> behaves like that when i use only 1 909 midi output into a splitter? it's
> basically 1 in, 2 out with only a 3 pin connection. there's no direct
> contact between the 2 outs in the split box. how can either the linn or the
> 909 detect when i stick a  second midi connector in there?
> the problem is the 909 is the only clock that &^%$ linn will sync to...
>
> i don't know how happy i'd be messing inside my 909 though.. one of the
> reasons i've stuck to toys and cheap machinery is the room to screw up..;-)
>
> thanks for the info so far!
>
> ruud
>
> ----- Original Message -----
> From: "Colin f" <colin at colinfraser.com>
> To: "Rude 66" <r.lekx at chello.nl>; "'synth DIY'"
> <synth-diy at dropmix.xs4all.nl>
> Sent: Tuesday, December 03, 2002 3:32 PM
> Subject: Re: [sdiy] midi clock
>
> > ----- Original Message -----
> > From: "Rude 66" <r.lekx at chello.nl>
> > To: "Paul Maddox" <P.Maddox at signal.qinetiq.com>;
> > <tim101 at tstinchcombe.freeserve.co.uk>; "'synth DIY'"
> > <synth-diy at dropmix.xs4all.nl>
> > Sent: Tuesday, December 03, 2002 1:34 PM
> > Subject: Re: [sdiy] midi clock
> >
> >
> > > i have this weird midi clock problem. i'm using my 909 to send midi
> clock
> > to
> > > my pc and studio, and to trigger an external midi-syncbox that sends out
> > > sync to the linn drum.
> > > now when i use the 909/linn combo alone, there's no problem. it syncs
> like
> > a
> > > charm. as soon as i hook up the second midi out to the studio, the sync
> to
> > > the linn stops. it does this both when i use the 909's 2 midi outs, and
> > when
> > > i use a splitter box for th midi signal.
> > > how is this possible? does the 909 stop sending clock as soon as it
> feels
> > > there's more than 1 midi input conencted to it? the weird thing is
> > sometimes
> > > it does decide to work. i've changed cables, reset things, you name it.
> >
> > Have a look at http://www.colinfraser.com/tr909/909mods/909midi.htm
> > That explains the problem when you have both 909 midi outs in use.
> >
> > Colin f
> >