It's strange that Studio One has an assignable "Arm All" keyboard shortcut, but they don't have an assignable "Unarm All".
2 workarounds for now:
You can assign the "Arm" function to a keyboard shortcut. This will toggle the arming of all selected tracks.
Better yet, if you have the Pro version, you can create a macro to set the "Arm" status of selected tracks to 0. Then assign that Macro to a keyboard shortcut. This will always UNarm all selected tracks (unlike the "Arm" function which which toggle the arm status).
The only trouble is selecting all tracks. The 2 simplest ways I know of to select all tracks:
- Select the first track and while holding SHIFT, select the last track.
- Put all your tracks into one folder, then by selecting the folder track, you can unarm all tracks contained therein using your keyboard shortcut. But if you're fine adding this folder to your project, just use solution # 2 below:
Put all your tracks into one folder (don't worry, you can still maintain your folders structure within this folder. Just select all your tracks and right-click > Pack Folder). Now clicking on the folder's Arm button will toggle the arming of your entire project together.