There are two kinds of passive DI boxes.

One is designed for Line Level input, the other for high impedance guitar input.

If you have the latter, safe to use it but plug its output into your soundcard's Line Input.

Yes, you could use the Bass Amp with headphone as Line Out into the soundcard's Line In, too. This actually might be desirable as you can dial in the level very accurately. Just try to set the EQ for a flat setup so that the plugin will be able to make the simulator sound like it is supposed to sound. Bass amps typically roll off one octave lower than guitar amps, be aware of that.


--Mac