1

Background

I'm trying to build a Max for Live device as a solution to the problem presented in this related question. As part of my solution I need to keep track of a group of notes (i.e. the selected, or in-scale notes).

My patch (see below) works great for any combination of held notes, but fails once the last note is released. When that happens, zl.len stays stuck at 1 and zl.mth continues to output whatever note was released last.

The question

How can I update my patch so that the length is 0 and the selected note is empty when the input list of held notes is empty?

What I have tried

I have tried banging the left inlet of the various zl objects manually and as part of the kslider update but this only produces the same unwanted behavior.

Here is a screen-shot of the patch:

Screen-shot of Max patcher

and here is the corresponding code:

----------begin_max5_patcher----------
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pGtRPW2tbKNMpit9J0D9MXvABqM
-----------end_max5_patcher-----------
JohnH
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Jens Ehrich
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2 Answers2

1

Indeed the only way to know if there is nothing in a zl group object is to somehow keep track of whether something came in.

Here is an example that should do what you are looking for if I understand correctly:

enter image description here

----------begin_max5_patcher----------
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-----------end_max5_patcher-----------
Mattijs
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  • Could you please explain how your code keeps track? I see that it works for length, but I'm a noob at Max programming and am not sure how to extend it to fix the selected note output as well. – Jens Ehrich Nov 01 '20 at 20:53
  • Currently it only keeps track of whether or not a note is selected. In this patch, indeed if you want to clear the [zl mth] when no notes are selected you can do a [sel 0] after [i ] and use that to send `zlclear` to your [zl mth], as you did in your answer. – Mattijs Nov 07 '20 at 12:40
0

With the help of the Cycling74 forum, I came up with this solution that uses borax to count the held notes, and as a trigger to clear the zl object when the count is 0.

screen-shot of selected-note patch

----------begin_max5_patcher----------
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-----------end_max5_patcher-----------
Jens Ehrich
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    Looking good! [borax] is maybe a bit overkill for this, but hey, it does the job.You could in this case replace the if statement with a [sel 0] if you'd like to simplify further. – Mattijs Nov 07 '20 at 12:42