Westone Thunder active guitar and bass manuals
1 - for early Thunder guitars with controls for volume, tone and active gain (Thanks to Malcolm Henderson)
2 - for Thunder guitars and basses with controls for volume, passive tone and active tone. I presume from the reference to models now having pull switches for coil tap and phase that this dates from 1985/6. Although the manual only refers to the Thunder IA and IIA lead guitars and Thunder IA and III basses, the controls are the same on the early active Thunder II basses