Electro Harmonix Switchblade Plus

I needed a switch to split my recording signal

A to amp (mic'd to interface)
B direct to interface

Unfortunately when switching to A+B
there was a drop in clarity of the signal to the Amp.

When unplugging the jack to output B the clarity came back.

I even tried the B signal for the tuner output.... Same thing.... Big drop in overall clarity to signal A (to the amp)

So as an A B switch very effective, switching from A to B had no tone drop at all.

But not usable as signal splitter (to i..e. 2 amps or split recording)

Maybe I recieved a defective item?

Have no xp with splitter pedals....