...the recorders I make today are replicas or near copies of the original instrument played in the baroque era.

It might seem unnecessary to make five alto instruments all in the same pitch, but I think we should maintain the diversity of the past. The stylistic differences between the various recorder makers were enormous, especially when they worked long distances from each other and were influenced by different musicians and composers of the day.
That is why each instrument not only had its own unique sound and look, but also its own individual feel to it when played. We can sometimes only guess at the use made of a particular instrument by studying its measurements.
If you have questions concerning the intonation, pitch or response of the various instrument, please contact me. The past masters made their instruments according to the needs and wishes of the musician, and that is the way it must stay ...