The organ of San Pedro Chicahua is an anomaly. It has the dimensions of a 4´ instrument with only four original registers, yet it is an 8´ instrument with a rank of right-hand horizontal trumpets added after the original construction to enrich the sound. The organ was too tall for the low choir loft, where the bellows are still located and was situated in a small tribune, proportional to the size of the church, which defined the dimensions of the organ. Rustically carved panels above the towers helped hide the largest pipes that protruded from the roof of the case.  The straight sides, metal tubing, and relative austerity of the case are characteristic of Puebla organ building. The case was varnished in the 20th century, which darkened the color and enhance the striated patterns in the painting. A tabletop square piano with a wooden lid sits on the floor in front of the organ; it appears to have been built in Puebla or elsewhere.