You can use capella- scan with any standard scanner.
Why not use high resolution?
When problems concerning the cooperation between scanner and capella-scan exist, check on the Internet if the scanner producer offers a newer driver software.
You can still work with the program:
You can use capella-scan without scanner.
capella-scan can read the following file formats:
When you are scanning notes at your friend's place or at work we recommend that you scan in grayscale mode.
You can find many PDF scores on the Internet.