Uhh I think you guys are confused. The only reason the multi effects unit works is because the Aux In is designed to accept a line level signal like a CD player, but the output of the unit is INSTRUMENT LEVEL so it can go to an amplifier.
006 said:
You have to realize that no matter what goes in to the pedal, it will always come out as line level for the amplifier.
That makes no sense. The output of a Tubescreamer or ANY OTHER GUITAR PEDAL is INSTRUMENT LEVEL. Why would an amplifier be designed to accept a line level signal? Are you supposed to run effects pedals with every amp setup? You aren't allowed to go direct from guitar to amp according to your logic because a guitar output is instrument level and the amplifier is expecting line level...If the amplifier was meant to take a line level signal, you could go straight from your interface to the amp and would need a DI box just to plug your guitar into the amp in the first place.
If you send a line level line impedence signal into a Tubescreamer, it still comes out at the same level and impedence because there is no transformer in the Tubescreamer to change it. That's why Reamp boxes were invented in the first place.
You can run a line level signal into a Tubescreamer and use the output knob to get it to the right level and it will work, I've done similar things just by running the output of my old Fast Track Pro into my V-amp and routing that back into the input on the Fast Track. It works, but it probably sounds worse than using a properly designed unit.
Part of me thinks that even though a multi fx pedal has an aux in and an instrument level out, it's not actually changing the level or impedence of the aux in. Aux In's aren't designed to be used for maintaining high fidelity audio, it's just for jamming along to tracks so the quality isn't crucial. I doubt there's a reamp system built into the pedal to properly convert the signal. It works, but it's not going to work like a Reamp/Redeye/X-Amp/ProRMP would that is designed to actually alter the impedence properly.