One of the things I love about my Salterelle Pastourelle III is its three banks of reeds on the right hand, tuned LMM (see Accordion Speak 101 for a complete explanation). My Castagnari Nik has a lovely, light, willowy sound, with its MM reeds tuned Tremolo Americano. But the low reed on the Pastourelle gives that intrument a lush fullness that knocks my romantic socks off. I very much enjoy having the choice of that full sound, and also having the choice of playing the low reed all on its own. It gives the instrument an entirely new character not to have all three reeds blasting away. This might be a case where putting in some stops -- rather than "pulling out all the stops" -- will lead to a better outcome. A close, intimate sound.
Here's a recording whereon I feature the low lonesome reed as voice on the Pastourelle. The tune is a waltz found on a recording by La Chavanée, Le Long de la Riviére. The tune was written by Philippe Prieur, cornemuse. It can be found in "the pink book."