Your welcome.
So it's the same preset you use when buchla is on it's own and when grouped, i must understand. That's what i asked about.
The preset you mention is a preset, that when you play Buchla as standalone, then it does'nt stop playing a key up. That's because it's programmed like that.
Both gate level 1 and 2 is positive as it is. Nothing that's set to close the gates unless you do it manually.
As i understand you have found out, then the sound does stop, when you stop a playing DAW completely so the DAW does'nt play at all.
I don't use Ableton Live, but i assume when you stop a group (clip), then the DAW is still playing. In this case it look like it wont send out the message that stop the sound. Perhaps because it would stop sounds you would like to keep playing too.
If you stop a clip where only Buchla is (not grouped), then i also will assume Buchla keep playing untill you stop the DAW playing.
Perhaps you in clips and groups can add a message to stop sounds playing in that clip or group only, as it look like it does'nt do that. I don't know if that's possible.
i don't know if it's possible for Arturia to add a stop sound when only clips and groups is stopped.
You can ask Arturia support. And you can also ask Ableton support, if you can do something in Live.
Perhaps you can learn to use Buchla V and perhaps find a way to make the preset to not need the constant open gates, and still work for you.