Last night I finished the A/B switcher I was making for a mate who plays bass. It has 2 channels (obviously!) with a selectable level for each channel. Levels can be toggled between active and passive, when in active mode there is a gain of around x6 right up, which is pretty intense and possibly a bit much. The active mode works pretty sweetly, but it is nice to have the passive option, where the volume only cuts, so that you can use the pedal with no power, or if you don’t fancy passive mode. So you do need to set the dials differently for both options – in passive mode you would cut the louder instrument to match the quieter, where as in active mode you would probably boost the quieter instrument to match the louder, but it is pretty useful and is generally a set and forget control.
I also added a LDR cut control (‘Suck’) which can be used for small swells and cuts, just for shits and giggles. It is pretty funky and just adds that something to the pedal that others lack. The LDR can be taken out of the circuit with the ‘Suck’ toggle. Housing the LDR itself in a 5mm bezel mount is a much neater way rather than the peep-hole with perspex window I have tried before.
I used a blue/red bi-colour LED to indicate the channel, which matches the red and blue knobs on the levels. Really simple idea, but makes channel identification a no-brainer! I’m really surprised I haven’t seen this on an A/B box before, it just makes sooo much sense!
Anyway here she is: