Not all are designed alike.

For example, there are some in which the 1/4" input has an impedance that is too low for the magnetic electric guitar pickup. Loads it down and changes the sound.

The EMU 1818 Audiodock is one such example, input impedance of around 10K ohms is fine for Line Level, but even though it has enough gain for a guitar pickup, that loading is a bit much.

A guy with a forumname of Takamine, though, shouldn't have any problem at all, for the Taks would have preamps in them for their piezo pickups. If he also owns a guitar with electromagnetic pickup and no preamp, could be problematic though.

The Presonus, as I already mentioned, should have no problems with any guitar or keyboard.


--Mac