This track uses the Konami VRC7 expansion chip, which adds six channels of FM synthesis (2-operator phase modulation), to the standard 2A03 set. However, the 2A03 channels are not used in this particular track.
Celestial Subterrane and Equivocal both use the sounds from FamiTracker v0.4.1, as this was the latest version available for accurate emulation at their respective time of composition.
The instrumentation in this album is almost indescribable, it's so different and feels like a breath of fresh air. The melodies are beautiful. ethbloom