This Alesis CD Twin Portable CD Backup and Copy System is fully tested and % functional. This is coming with all of its original shipping contents. Manual. The Alesis CD TWIN CD Duplicator is the easiest, fastest, and most flexible solution to affordably back up audio and data from all popular CD formats. The Alesis. Buy Alesis CD Twin online from Unbeatable prices and next day delivery from the UK's no1 instrument store. Order Today.