Separating multiple trigger burst into individual triggers

I need to separate a burst of three triggers into only one pulse so I can only use the first one to trigger another circuit, as I don't want it to re-trigger with every pulse, is there a simple circuit that can do this? It's coming from a sequencer cpu so I can't really reprogram anything.
 
Use a flip flop to trigger and arrange a reset pulse a moment later.

Would that be just putting the trigger burst through the flip-flop and using a clock to only set on the first? Because I don't want to have to add a separate clock just for that, I do actually have a pulse a moment later already available as the sequencer outputs three triggers in a burst and a fourth one right after on a separate channel, but that would still need an initial individual pulse at the same time as the burst is triggering would't it?
 
Pulse stretcher circuit using a 555 ?

That might work, I'm looking at circuit implementations and I'm not sure if there's a way to make it stretch enough to cover the three pulses, and also I would need to then filter the stretched pulse and put it through a comparator to get a 1ms pulse as that is what I need. I've also been looking at clock dividing circuits with an AND gate to recondition the output pulse to be the same length as input but your solution might still use less components.
 
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Given I don't really understand what you are trying to do:
If the pulse can be sensed on an arduino 5V (or 3,3V) input pin then either count 3 pulses or introduce a delay after triggering on the first pulse. Output from another pin.
Around £2 for a Nano is hardly driving cost up.
 
Given I don't really understand what you are trying to do:
If the pulse can be sensed on an arduino 5V (or 3,3V) input pin then either count 3 pulses or introduce a delay after triggering on the first pulse. Output from another pin.
Around £2 for a Nano is hardly driving cost up.

The pulse is 5.7V but is there a way to program the arduino to only output the first pulse? I just need the first trigger out of a burst of three output by a sequencer for a clap voice, because I want to use it to trigger the reset on a CD4017 that sends a new burst itself to be able to change the amount of hits and spread of the clap
 
That might work, I'm looking at circuit implementations and I'm not sure if there's a way to make it stretch enough to cover the three pulses, and also I would need to then filter the stretched pulse and put it through a comparator to get a 1ms pulse as that is what I need.


In that case a microcontroller might be more flexible. Just program it to ignore inputs for a certain window of time after each trigger event, so that only the first of the triplet gets to trigger.
 
In that case a microcontroller might be more flexible. Just program it to ignore inputs for a certain window of time after each trigger event, so that only the first of the triplet gets to trigger.

Well I might use an arduino mini pro for midi implementation, I'll have a look and see if there's a spare input and output and modify the code, not very well versed in arduino coding though so if there are any sites with info on how to do just that I'd appreciate a heads up