Looks good, model for Calibre 10 UI, maybe.
Can't find a way to drive it from the keyboard:
- no shortcuts apart from 'whatever' to open it, and Esc to close it;
- no accelerator keys (Alt+?);
- no Tab order.
Could the Shortcuts panel also list the Defaults or indication that the value shown is a Default or Custom setting.
Could you make the Audio feature configurable, including Hide it.
And a query, where does CCR History feature get it's data?
BR