[sdiy] Roland CR-8000 triggering

Nicholas Keller niroke at tampabay.rr.com
Sat May 23 17:24:16 CEST 2015


That would be the better solution to what I suggested

> On May 23, 2015, at 10:01 AM, Travis Thatcher <recompas at gmail.com> wrote:
> I built one for my CR5000 using an Arduino. Its a bit crude but does
> the job really well, also does Midi-sync and Din Sync out. I have a
> switch to turn off the midi control of the clock so it just does
> triggering or can use the internal clock. The cool thing is that if it
> is under midi clock control you can still sequence it and use the
> patterns at the same time.
> https://github.com/TravisThatcher/MIDI_TO_TRIGGER_SYNC
>> On Sat, May 23, 2015 at 4:12 AM, Adam Inglis <21pointy at tpg.com.au> wrote:
>> I'm looking at installing a midi to trigger interface in my CR-8000, but I
>> want to retain the internal trigger function. I need a way of isolating the
>> two trigger sources from each other.
>> The internal trigger system is from the CPU, via some pull-up resistors and
>> a buffer, giving negative-going triggers from 5 - 0 volts, seen in this pic
>> here
>> http://www.adambaby.com/images/tech%20pics/CR8000/CR8k_CPUtrig.png
>> These triggers go to the various analogue voice circuits, here's a couple of
>> examples, bass drum and hand clap
>> http://www.adambaby.com/images/tech%20pics/CR8000/CR8k_BDtrig.png
>> http://www.adambaby.com/images/tech%20pics/CR8000/CR8k_claptrig.png
>> I tried duplicating the input capacitor seen at the trigger entry in these
>> voice circuits, for each trigger source, however this attenuated the  pulse
>> too much resulting in a different voicing (proving that these circuits can
>> be "velocity" or voltage sensitive).
>> Elby Designs, who make the MIDI2SDS16 interface that I'm testing, say that
>> in general you can't have both connected at once.
>> Any thoughts?
>> cheers
>> Adam
>> (BTW, Roman asked re a previous post whether there was any change of voicing
>> with pulse width variation. In the first pic you can see they quote a huge
>> range of variation as the width varies with the tempo, from 4 - 70
>> milliseconds. So I guess the pulse width can't be critical. I haven't tested
>> below 4 ms though.)
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> -- 
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