1.
Input ‘D’ for inst./mic./line usable as an in/out in dual A/B mode.
2.
Input ‘C’ for inst./mic./line usable as an in/out in dual A/B mode.
3.
Input ‘B’ for inst./mic./line usable as an in/out in dual A/B mode.
4.
Input ‘A’ for inst./mic./line usable as an in/out in dual A/B mode.
5
. Main output for all 4 inputs. Usable as the in/out for A/B in dual A/B mode.
6.
D and C output, or input. Signal path can flow either way.
7.
9 Volt input / output - Plug 9V power into one of these 9V jacks. 9V power
automatically comes out of the second 9 Volt jack. This is a 9 Volt jumper system.
DO NOT connect 9 Volt power into both jacks at the same time.
8.
Auxiliary 9 Volt input / output - The 9 Volt jacks are either an input or an output.
Only one 9 Volt power in is required to power the 421 pedal.
