It's been many years since I have made any CDLC, totally forgot how to do it. I have been trying to edit some CDLC the past few days. I found this, and I followed the steps in it and it worked great.
Here's my workflow for editing existing CDLC that works for me:
Use the toolkit CDLC Creator GUI and press "Import Package" button. Select the CDLC that you want to edit.
Wait for the CDLC to be loaded into the toolkit GUI. At this point the toolkit has unpacked the CDLC and created an EOF artifacts subfolder. The EOF subfolder contains all the files you need to edit the CDLC.
Now open EOF "File" and select "New". Open the EOF subfolder that contains the unpacked CDLC artifacts created by the toolkit above. Select the main audio ogg file from the EOF subfolder. Provide the Artist and Title info for EOF. Select "Use Source Audio's Folder' and wait for EOF to load the ogg file.
Press F5 to see the auido wave form in EOF.
Next in EOF select "File", "Rocksmith Import" and load the Rocksmith XML Arrangement (Lead, Rhythum, Bass) that you want to edit. (Ignore any warnings or just answer 'Yes'). (EDIT: Since you are using the same audio as the original CDLC you can) resync the Arrangement to the audio waveform as necessary using Ctrl-A, then Ctrl-Shift drag.
Edit away in EOF and then save the edited arrangement.
Back in the toolkit, select the old arrangement and "Remove" then select "Add" and the new edit arrangement that you created in EOF. Finally press "Generate" to create a new CDLC package. Let the toolkit create new 'Arrangement Identification' so that the edited version is distinguishable from the original in the game.
