DIY box for adding shuffle to a Sync Signal

[Paul Perry]

At 01:27 AM 29/12/99 +1100, Sam Gilmour wrote:
>
>    Hi I have been racking my brain trying to think of how to make a sync
through box which would add swing to sync.  It would be useful for making
drum machines without shuffle settings swing.  It takes 6 triggers to make a
drum machine step to the next step.  So I assume if I were to somehow split
the signal so
>
I don't know exactly what 'shuffle' is on a scale of 1 to 10,
but the approach I would try is this:

Run the raw sync into a ring counter.
Take each ring counter output to a one shot, with a pot on each to adjust delay.
Then logically add the delayed pulses back together.

OK there are problems with this, because you need to delay ALL the pulses, 
which makes 6 times as many delay units as you really should need.

You could do the 6 to 1 division OUTSIDE the drum box, do the delays,
then insert 5 'dummy' clock pulses after each delayed one. (these would have
no effect on the timing themselves). I'm currently wanting to try this to
drive an Oberheim drum machine from a Blacet MIDI-DIN PIC convertor.

The killer part of this is to ensure that no pulses are delayed so far that 
they are overtaken by a following one.

Of course, if you can hack into the drum box and just put an adjustable delay 
on each trigger, the matter is trivial.

paul perry Melbourne Australia