Doepfer

Sean,

you find my comments written inline.

Dieter Doepfer


> I'm aware of the triggering setup for the CTM64 and how it works
> with shorting a pin to ground to get a trigger.

That's not the way how the CTM64 works ! Please refer to the CTM64
information:
" Pay attention that only free contacts can be used. This means that the
contacts are not allowed to be connected with another electronics or
connected with a fixed voltage (e.g. GND)."

> I was using it about 8 years ago with a calculator keypad attached to my
bass
> guitar to trigger MIDI events in Logic.

I cannot imagine that this was working ever ! The 64 connectors of the CTM64
are outputs (!) that are normally in the high state and change to the low
state for 1/64 of the scanning time. If you connect one of the CMT64 pins to
GND nothing will happen. You have to use the common feedback rail
(attention: this is not GND but a line that carries the scanning feedbacl
signal) to make the CMT64 working.

For details please refer to the CTM64 user's manual

> I haven't powered it up for ages and it doesn't want to play nicely
anymore.
> I've tried shorting the ground pin to any of the individual
> contact pins but it doesn't output a trigger.

That's what I would expect.

> All the jumpers are in place and haven't been moved since the
> original setup.
>
> I have no experience with PIC chips so am not sure how
> serious/terminal a problem this is.
>
> Anybody experience anything similar?
>
> Sean
>
> --- In Doepfer_a100@yahoogroups.com, Florian Anwander
> <fanwander@...> wrote:
> >
> > Hi Sean
> >
> > > Mine's not sending any MIDI output when triggered, and the
> triggering doesn't dim the LED.
> >
> > Just to make clear, that I do not misunderstand you: You know that the
> > CTM64 does NOT convert triggers to MIDI? It is intended for old organ
> > keyboards (and similar) which have one common wire, and 64 contacts,
> > which can be switched to this wire.
> >
> > IT DOES NOT WORK WITH TRIGGER INPUTS!
> >
> > Florian
> >
>
>
>
>
> ------------------------------------
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