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Rui, as babarosa was saying in another thread, your devotion to this project really deserves some credit :) it's one of the most active linux audio projects and as far as I can tell you're the only main coder. latest svn is opening the file without problems (so I guess the stacktrace I was getting was similar to yours, though I'm not really able to tell).

Regarding the use case, the inserts on the tracks were not to external jack-applications, but to qtractor busses. What I wanted to do was create a Reverb bus, a Distortion bus and so on, each with certain ladspa effects in their inserts, and then for each other track/bus decide how much signal to route to each of these buses. So if I have two audio tracks, for each I can decide how much of it goes "clean" and how much gets routed through the "Distortion" bus.

So last week I was tampering around with this, and I can't really remember now what I came up to. IIRC the "Aux Send" function, which I presume is there to do exactly this, didn't satisfy me because I couldn't "split" the signal, like I can do with the "Insert" thing (which presumably is there for external jack apps) - with that I can decide independently on how much signal goes to the bus and how much bypasses it.

I tried reopening now the project, and I found that on the "Distortion" and "Reverb" busses I can move the ladspa insert plugins on the output busses, and it still "works". But instead on the other tracks/busses in the mixer, those which I want to route to Distortion and Reverb, the inserts to those busses have to be in the inputs; if I move them in the outputs I get only "clean" sound, i.e. like if the "Send Gain" was set to 0. But I guess that is allright and how it is supposed to be...

BTW, I found a potential bug: if I have an insert on a bus/track to route the sound somewhere else, with "Sends" and "Returns" properly connected, and I move this insert (by drag and drop and then select "Move here") to another bus/track, the "Sends" and "Returns" connections are lost. Don't know if it's intentional but it would seem more intuitive to me if the connections were preserved.... otherwise one would just create another Insert instead of moving this.