Hi Robert !
Thanks for your kind words :p.
You are right about the live thing. Now the audience has to hear the click track and that's not very convenient.
The workaround for this is to pre-record your first track (possibly with the metronome) and use it as a sort of metronome track for your live event. But that's not totally perfect as it's way more cool if you can play and record all your tracks live.
I've thought about how to do this right, and the start recording threshold may be part of the solution, but only half of it because it doesn't handle the stop recording part. So I have to find a way to handle this to have a complete solution.
A "signal down" threshold for stopping recording is of course inefficient, and specifying the length of the track in advance would be too imprecise timing if you can't hear the click. You could stop the recording manually, but it doesn't work in all situations. However it could be acceptable.
In my opinion, an efficient way of dealing with this would be to split the stereo output by being able to send the 4th track to Left channel and all the other tracks to the Right channel. That way you have a click track for your own use and you can route the Right channel to your amp/console. Maybe with a way of automatically redirect the 4th track to the Right channel as soon as you start recording on it.
What do you think ?
I don't plan to do the crop track feature. For now, I prefer to spend time on making the live usage better, hopefully leading to not needing the crop feature anymore

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Raphaël