I have used just an old electronic reverb unit or played right out of my sound card. Although I recently purchased an M-Audio sound card. Which is supposed to be a good sound card for guitarists.
At one time, I had an Arion stereo delay pedal.
I played both the guitar and keybaord through that.
It was almost space sounding.
Almost an early seventies feel.
Unfortunately, it got lost or stolen when I moved from my last place.

Matt