1986 Keyboard Magazine Sound Special Vol. 7. This item has been stored in a warehouse for many years. ☆ AI Search Summary A special issue covering the usage and performance techniques of the Yamaha DX21. - Title: Keyboard Magazine Sound Special Vol. 7 - Target Instrument: Yamaha DX21 - Contents: Enjoyable usage, performance techniques - Production: Abic Corporation - Table of Contents: Songs, performance techniques, techniques Thank you for viewing. ★ Please note that the cassette tape is not included. As this is an old item, please refer to the photos and understand before purchasing.