Hod is the filter’s cutoff, allowing only a portion of the signal through.
If you want to know what the individual sefirot are in this piece, here’s a guide:
Chesed (blue) is of course first, and has no additional instrument.
Gevurah (red) starts at around 4:27 minutes (its additional instrument is an autoharp that also modulates the synthesizer).
Tiferet (green) starts at 9:54, and has added lap steel guitar.
Netzach (light pink) starts at 15:37 and has no added instrumentl.
Hod (dark pink) starts at 19:34 and uses Sidrazzi Organ (again, contact me if you want more info about the Sidrazzi).