I have uploaded a project here:https://www.dropbox.com/s/67b3zu5xs18vu6m/Amorphis%20-%20Day%20of%20Your%20Beliefs.rar?dl=0 This is my workflow: 1) Create tone change. 2) Give a descriptive name, like "Acoustic", "Distortion" or "Lead", for example. 3) Save project in EoF. 4) Add XML file as arrangement 5) Toolkit loads the descriptive tone names 6) Add real tones to my tone list 7) Edit arrangement to change the tones to the ones that I have loaded. 8) Make everything else correct in toolkit 9) Save 10) Generate 11) ERROR Note: it does not matter if I load the real tones (the ones that I'll use/try out) before or after I add the arrangement. The problem is that the toolkit changes the XML file to reflect the changed tone names in the <tonebase> <tonea> etc fields, but not in the ones after that, the fields that specify the time of the tone changes: http://puu.sh/i4QN1/e8e89524b5.png So in the above case, the EoF tone names have been changed from Clean and Distortion to Clean_Reverb and endofhope, respectively. Done manually, by me. In the Edit arrangement box. The <tone time> stuff still uses the old tone names, and therefore returns an error. If I manually edit those tone names to Clean_Reverb and endofhope, the package generates just fine, and the song plays just fine as well. If you need anything else, let me know. PS: The project I've uploaded is a different project from the one described here.