As a concertina newbie, one of my challenges is understanding the range of timbres that different concertinas make and how to talk about the differences. This makes it harder to understand if I've even heard concertina timbres at the ends of the spectrums. This leaves me with two questions:
1. What language or taxonomy do you find useful to describe concertina timbres? For example, Walker concertinas has a "mellow" to "bright" scale: https://www.wakker-concertinas.com/anglo overview.htm
2. Which individual specimens of instruments would you point to as examples of the poles or extremes of concertina timbres? If a good quality recording is easily available online, I would find that a really helpful resource.