Quote:
Originally Posted by Alain78
trigger it via the Run button : the result is the same : No Effect !
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Very strange. From the screenshot I can't really see anything out of the ordinary (assuming Track 1 is visible and not locked somehow).
Have you already tried if using IDs for other Tracks (than Track #1) are working - like, for instance ID 30 (Track: Toggle mute for track 02) or ID 33 (Track: Toggle record arm for track 02)?
Otherwise also try if restarting Reaper makes any difference, just in case ...