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ABY without volume drop

OK so I searched for a while and didn't see this exact question asked. I currently am running two separate channels split by a standard passive ABY box. The A/B switch is fine, works perfectly, but when I am in Y mode, both channels experience a volume drop (which makes sense since I'm splitting the signal between two channels). This is a problem, because I use the Y mode specifically so I can occasionally add a distorted signal over the top of my clean signal, to thicken up choruses and also under my guitarist's solos. But when I kick it into Y mode, my clean signal drops in volume, and it sounds like crap.

So I guess what I really want is not a true splitter, but instead a pedal that can output my original signal at the original volume on two channels a the same time. So its more of COPYing my signal than splitting it. Anyone have any ideas?
 
My guess is that you have a pedal that puts you out of phase and when the two signals are blended togheter they destroy themselves because they're out of phase, Had that with my guvn'or
 
You need a buffered (active) ABY - plain and simple. I suggest a Boss LS-2.

The issue may be affected by phase, but most likely the effect you're hearing is because the input impedances of both amps are connected in parallel in Y mode. This effectively halves the impedance seen by your guitar - causing it's output to droop and the high end to roll off.