Yamaha YC-30 Manual
The YC-30 is just unique. Sun Ra used it, among many others. Here’s the owners manual. YC30E
Ensoniq SQ-80 service manual
written by THE SQ-80 specialist, Rainer Buchty. Ensoniq SQ80 Service Manual
ADR PanScan manual
The ADR PanScan A nice device but the manual is quite rare. Here is a copy: adr_panscan_user