Based on the users' reviews of the Qanun HD app, here are three cons and pros in English, limited to 15 words each: **Cons:** 1. Some users found the app's user interface cluttered and confusing, making it difficult to navigate. 2. A few reviewers experienced issues with the app's sound quality, reporting distorted or muffled notes. 3. Some users felt the app lacked features, such as the ability to slow down or loop recordings, which hindered their learning process. **Pros:** 1. Many reviewers praised the app's accuracy, saying it helped them learn the qanun's subtleties and improve their playing skills. 2. Users enjoyed the app's expansive library of songs, which they found helped keep their practice sessions engaging and varied. 3. The app's tutors and instructors were widely praised for their expertise, patience, and ability to explain complex techniques in an accessible way.