How do you put multiple tracks on one track with the Fostex mr-8?

To put multiple tracks on one track with the Fostex MR-8, first, select the track you want to record onto. Then, set the MR-8 to "mixdown" mode. After that, play back the tracks you want to combine while recording onto the selected track, allowing the MR-8 to mix them into a single track. Finally, make sure to adjust levels and effects as needed before finalizing the mix.