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The C Widebody also features the square ramp but has a huge round chamber to put some width back into the bottom end. Makes a nice fat sound but still has some projection at the top end.

We are testing two new products at the moment; a Wooden mpc and Bari plastic reeds.
Here are some pix of the Wooden alto mpc. We compared it to Yamaha 5c and an Aquilasax Plastic.

The wooden mpc has a softer sound and a quirky ligature, a wooden ring that slides on over the reed and uses friction to hold it tight. The Mpc itself is similar to the Yamaha in size and configuration, slightly smaller so the Yammy lig fits but the wooden lig is too small for the Yammy mpc. The upside of the wooden lig is that it is so fast to change reeds. You may also remove it accidentally.
For those looking for a mellow sound, this might be the answer. Playing characteristics are similar to the modern mpcs with a modern chamber design.
Matches great with the Aquilasax Antique Copper C tenor.