change pitches to rests random in score object

[gratkowski]

Hello,
I want to turn several chords random chosen in to rest. Kind of filter out notes by probability.
Somehow all my approaches failed so far.

Can anybody help me with that?

Thanks Frank

[danieleghisi]

You can send a message such as
[unsel all, sel note if "random(0, 100)<50", delete]

[gratkowski]

Hi Daniel,
Thanks, that's easy. Unfortunately it doesn't treat tied notes throw bars not as one note or cord.
I found a (much more complicated) way to generate new score objects but still can't solve the tie problem.
I also would like to generate a second voice with the complementary pitches and rest. In other words I would like to split the voice in two parts randomly. I got that worked out too but the tie problem still exists.

[danieleghisi]

I understand.
You should use bach.beatunbox and bach.beatbox if you want a clean solution hqndling ties.
But I agree that there should be a simpler way with in place selection .
If you wanted to only select non tied notes you could do that via
sel note if random(...) and tie == 0
but that is not the cleanest solution. Ideally one would have a @withties message attribute so that if you select a note, you select all the tied sequence as well.
Doesn't look too hard to implement, maybe for next version.
For the moment, you can rely on patching with beatbox/beatunbox

[gratkowski]

Hi Daniel,
unfortunately beatunbox doesn't work, wehen I have a tie between bars with different n-tuplets. i.e. last 16th of a quintuplet gets tied to a first 8th of a triplet.
I got it worked out with a quite complicated patch dealing with cent, duration, velocity and tie separately. Is there maybe an easier way because the problem also appears when I just want to change pitches.

thanks

frank

[gratkowski]

Daniel,

the problem with the ties also appears in your example file for rhythmic talea (looking glass o) and the permutation (looking glass p)

best

frank

[danieleghisi]

Hi frank, can you send me a minimal example of the issue? I'll look into it.

[gratkowski]

Hi Daniel,
sorry for the late reply, I was on tour.
Here is the example. It is your Looking Glass Patch P
Beatunbox doesn't work with ties between different subdivisions ...
I found a way to make it work but it was not simple at all and makes beatunbox useless.

best

Frank

Looking Glass P :
<pre><code>
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-----------end_max5_patcher-----------
</code></pre>

My most likely very inefficient solution:
<pre><code>
----------begin_max5_patcher----------
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liabVi6TFiSPCImv8IRecTNOYD9NoOWmnblQ3ft69269+wNvzC.
-----------end_max5_patcher-----------
</code></pre>

[danieleghisi]

Hi, I think you want [bach.beatunbox @merge 2]
That should solve your issue, because otherwise it only gathers chords that are DRAWABLE (it will never gather a tie spanning 5/16).
Perhaps that should be the default, and maybe it was at some point, since the tutorial used to work

thanks for notifying, please tell me if that solves your issue.

[gratkowski]

Hi Daniel,

thanks a lot. All works fine now.

best

frank