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Have anyone tried these? I got both the solo and regular models from local musicshop. I'm trying if they would work better for me than my other moutpieces. The main idea is to experiment the sound of both models and see how they differ from each other and my other mouthpieces.

Do you have any opinions of these?

The "solo" model appeared in 2004 from a brass group named for a country north of the border. It's not a bad mouthpiece but I am 99.99% sure that Mr Jacobs never ever saw that mouthpiece, a long story - check the archives.