Based on my research, the term "manualiter" in music refers to indicating that a piece should be played with the hands, as opposed to the feet using pedals. Several sources mention "manualiter" in the context of keyboard music from the Baroque era, especially works by Johann Sebastian Bach.
For example, the Clavierbung III source mentions several pieces marked "manualiter", meaning they should be played using the manual keyboard with the hands, as distinguished from "pedaliter" which indicates using the pedals. Similarly, the study of Bach's Toccata in E minor notes that "manualiter toccatas" refers to toccatas meant to be played with the hands only, using the manual keyboard.
Organ compositions that are to be performed on the manual alone, i.e., without the pedals.
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