Teac GigaStudio 4 - Manual (Page 136)

GigaStudio 4 Reference Manual 136
Therefore, in narrow view, you can tell the EQ status at a glance.
•
Master EQ button gray: no stages are enabled.
• Master EQ button bright green: at least one stage is enabled.
• Master EQ button dark green: at least one stage is enabled but the master EQ switch is bypassed.