You can buy piano roll boxes direct from QRS.  There are other
sources which some say have better quality, but I have been quite
satisfied with QRS boxes.  After all, you probably aren't going to
be playing same roll repeatedly, so as long as a box provides good
basic storage you'll be okay.

Dennis Steckley

 [ QRS Music Technologies
 [ 269 Quaker Drive
 [ Seneca, PA 16346
 [ https://www.qrsmusic.com/ 
 [ https://www.qrsmusic.com/pno/products.asp?cid1=147&pid=3267 
 [ email: qrsusa@qrsinc.com.geentroep [delete ".geentroep" to reply]
 [ -- Robbie