Alto cornetti, tuned in F (one tone lower than the sopranos), were common during the renaissance. Many of the inner voices marked as "cornetto" in pieces by Gabrieli and his contemporaries were thought for such an instrument (or sometimes a tenor) as they are too low for a soprano in G.
An alto instrument in F at 466 Hz. can also be used as a soprano instrument in G at 415 Hz. which many times can become very handy (even though an alto instrument is darker in colour and slower in response than a soprano and will make virtuoso passages rather difficult to play).
Alto cornetto in 466 Hz. compared to a soprano in 466 Hz.
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