Clip emptier

[jbucks]

Time to build my first Max for Live patch!

I'd like to create a custom button for one of my MIDI controller's pads (an Akai LPD8). This button would clear any MIDI note and clip envelope data within an existing MIDI clip on whatever track is active, but only when that clip has finished playing. In the same way as when you trigger a clip to play, but it doesn't start playing until a point defined by your global quantization settings, I thought to have a 'clip emptier' wait until a MIDI clip has finished playing, and then delete its own MIDI note data.

In other words, if I press a pad on my MIDI controller, then this clip emptier deletes whatever MIDI sequence is inside the active track, but not until the sequencer has finished playing.

Does such a device already exist? And if not, is there a variable within Live accessible by Max for Live to allow this kind of change to a clip to occur, according to global quantization settings? Like some kind of conditional which tests to see if a clip has finished playing?

Any guidelines or advice to help me get started would be really helpful, thanks in advance!

[chapelier fou]

This seems definitely possible.
Check the "clip" and "clip slot" sections in the LOM (in max, click help then m4l), and search for actions about notes. Can't help more for now.

[Surreal]

I think it would be as simple as

call select_all_notes
call replace_selected_notes
call notes 0
call done

should be pretty straightforward if you don't need any conditions.

[Surreal]

HA there are conditions.

i suggest you build the empty logic first.


when you say "not until the sequencer has finished" do you mean the set stopped, or the clip stopped, or the playhead reached the end of the clip?

[jbucks]

Thanks Chapelier Fou and Surreal for your replies! They are already of help!

@Surreal - I imagine that the clip would be emptied when the playhead is at the end of the clip. So let's say I have a 2 bar loop, I would press the 'empty button' for that track while that loop is playing, but then the clip wouldn't empty itself of MIDI notes until the end of that 2 bar loop (or whatever sized clip) has been reached.

Thanks again!

[Surreal]

I would suggest trigger on stop. an empty clip wouldn't make any sound anyway. following the playhead is pretty unreliable. Try it, maybe it will work for you, but you cannot guarantee that the playhead will hit the end of the clip, ever.

[11olsen]

you can clear out the notes but i don't think you can change the clip envelopes with a m4l device. someone correct me if i'm wrong.

[chapelier fou]

I think you're right.

[jrs1]

I wrote a clip midi clip emptier.

here is the first draft.

BUT - it seems to crash Live when I use it. Though I just made some changes & streamlining, perhaps it won't crash now.



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