PD help

[Marc Nostromo [M-.-n]]

Thanks for that. Googling your terms made me find the "change" module that
does exactly what you describe !

2011/11/15 Martin Naef <mnaef at navisto.ch>

> On 15.11.2011 16:27, Marc Nostromo [M-.-n] wrote:
>
>> I'm trying to do some basic stuff in Pd and it turns hairy. Right now
>> I'm recieving a continuous signal that I restrict to 0 and 1's so my
>> stream now looks like
>>
>> 000001111000100100111111000000**00
>>
>> I would like to send a midi note on only when there's a change 0->1 &
>> 1->0. Any idea on how to achieve that ?
>>
>
> It's been a while since I did this kind of thing in Max, but I remember I
> had a similar issue when I wanted to filter out excessive data.
>
> My idea would go along those lines:
>
> Use a comparison operator that outputs a bang when left value != right
> value
>
> The bang triggers your midi
> The same bang also triggers an update of the right value in the comparator
> (in a sort of feedback loop)
>
> This works nicely because most operators only output when the left input
> has changed, not the right one (or the other way around...). Otherwise, a
> set X message usually works as well (it only sets the value, but doesn't
> trigger)
>
> How to store the last value to update the comparator? Use a value object
> that receives your input data, but prefix the data message with a SET so
> the value object doesn't output whenever it changes. Trigger the value
> instead with the output of the comparator.
>
> Does that help? It's hard to describe without having Max running in front
> of me...
>
> Martin
>
>
>
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