You're right, I let that one slip. Sachs does mention it and says it has more than 88 notes - a wider range than a piano! I had no idea it could do that.

Amazing things, once you've spent 20 years learning where all the notes are.

I've been listening to a lot of Piazzolla lately and thought maybe I could play some of his stuff with a couple of friends (none of them bandoneon players) so I went to a music shop yesterday and looked at some of his scores to see what might be involved in arranging them. Jesus H Christ. All those super-high-speed syncopated/tripletted runs that take off like a rocket from the extreme bass up into the stratosphere. Utterly impossible on anything I can play.