The TR-1000 does not allow the same analog generator to be used on multiple tracks simultaneously. Each track has its own independent sound generator section (GEN), so one generator cannot be shared across different tracks.
For example, if you assign the 808 Bass Drum to the BD track, you cannot assign the 808 Bass Drum to the SD track at the same time. Instead, you can assign other sounds, such as the 808 Snare Drum, to the SD track.