Analogue-sequencer

Hi Colin,
This morning I downloaded the midi2din2midi HEX-file again, asuming 
that it will give a 4 ms pulse, and putted into a new pic and still 
the cr-8000 did the swingy thing, and it seemed to run on half tempo. 
After the cr-8000, I tried it with a mc202 and a tr606, and both 
machines synced very well. After that I tried the cr-8000 with the 
sync from the P3, and that also works very well. And yes I will order 
an other P3 for that, cause I also like the other features from the 
machine. Some friends of my also want such a great midi to din 
device, so I let you know this week if I order 1,2 or even 3 P3 
boards! So this problem is solved and I'm very content with the 
midi2din2midi device as it is. 
By the way I found out that I can run the Korg kr55 from the midi2din 
device so I don't use a 48 ppq sync output anymore. But I got an 
other problem with that. I want to use the 5 Volt start/stop signal 
from the midi2din to start and stop the Kr-55. It has an jack input 
for start/stop, but this input uses a 5 volt pulse to start and an 
independent pulse to stop ( or shorting to ground instead of a 
pulse ) So when I start the P3  the Kr-55 starts running, but when I 
stop the P3 the Kr-55 just keeps on running, and when I start the P3 
again the Kr-55 stops running. Does anyone got a solution for this 
problem?
Cheers,
Roel


--- In analogue-sequencer@yahoogroups.com, "Colin f" <colin@c...> 
wrote:
> > Some while ago I told you that the midi2din was working perfect, 
but 
> > not on the cr-8000. The cr-8000 "swinged" like hell, but not in a 
> > musical way. You told me that I should compare the clock signals 
on a 
> > scope from the devices I run my cr-8000 with. I did and I found 
out 
> > that the sbx-10 (Roland syncbox) has a "square wave pulse" as a 
clock 
> > signal, and that the midi2din produces a really narrow pulse as a 
> > clock signal. You told me that it was not a problem to make the 
pulse 
> > less narrow, but that that would affect the timing accuracy, or 
> > something. I would really like a less narrow pulse so how should 
I do 
> > that? I use an external powersupply with the thing, so power is 
not a 
> > problem.
> 
> The original Roland clock oscillators in something like a TR808 or 
TB303
> generate a true square wave.
> I did a fair bit of research into the importance of this, especially
> with respect to the TR909, as I knew it was doing it's shuffle at a
> 48ppqn resolution, and I thought it may have been using the trailing
> edge of the din clock as a reference. But I found that the 909 only
> cares about the start of the clock pulse, and interpolates the 
middle
> position.
> For the other devices I looked at, I found that as long as the 
pulse was
> more than 2ms long, it would work fine. I had reports of some older
> Roland gear having trouble, so I increased the length of the pulse 
to
> 4ms.
> Do you know if your m2d2m is doing 2ms, or 4ms ?
> Making a longer fixed length pulse, which reduces the maximum 
possible
> tempo, is a poorer solution than doing a 50% duty cycle square wave
> clock, but that is probably beyond the capability of the PIC 12C508 
I
> used for the convertor.
> Funnily enough, the P3 outputs a true 50% duty cycle square wave 
sync
> pulse, as it has to do clock multiplication of the incoming midi 
sync to
> it's internal 48 ppqn resolution, so it's an easy matter just to 
toggle
> the din clock line on the off at every other 48ppqn pulse, whether
> running from midi or internal clock. Does the Cr8000 work OK from 
P3 ?
> I guess you could use another P3 just for this ;-)
> Or you could plead with me to do a simple sync convertor with true 
50%
> duty clock output.
> 
> Cheers,
> Colin f