Hello everyone, I want to suggest to add the aubio tools (https://aubio.org/) to the utilities section on the jack applications page (http://www.jackaudio.org/applications/). The tools can be used for audio labbeling. I personally use aubiotrack from the aubio-tools package (standard package in ubuntu) to sync music to lights in realtime together with QLC+ using aubiotracks midi output. Aubio comes with jack support. Best regards Tobias (topas-rec)