Sebastian Aguilera de Heredia (1561 – 1627) was a Spanish monk, musician and composer.
He was first the organist at the cathedral in Huesca from 1585 to 1603, and then moved to a more prestigious position as maestro de música at La Seo Cathedral inSaragossa.
He published a collection of works in 1618, and eighteen of his keyboard works survive.
He is considered the first major figure of the Aragonese School of music centered on Saragossa.
This Tiento Lleno (a piece for undevided manual) starts with a slow and lingering introduction, then goes to a quicker pace in a rather brilliant middle section and finally concludes in triplets and broad final chords.
I chose the registration according to that:
Flautados 8 for the introduction
Flautados 8 and Octava 4 for the second section
8,4,2, and quint for the triplets
Ending with broad plenum including Trompeta Real (the trumpet IN the casing).
It is not common practice to mix trumpet and Plenum in old Spanish music, but it just sounded right.