As an experiment in 1996 I made recordings of 2 pieces on 3 different instruments: The vals Desde el Alma and a piece of Bach on
The Pictures of instruments 1. and 2. are available at
DeJean's Bandoneon Pictures
Instrument 3. (Gutjahr's last one) looks like no. 2. but has a
smaller dumper case (2 cm instead of 2,5 cm height).
Although I tried to make good recordings (not musically) the differences
on the recording appear not to be as evident as they are really.
I have replaced the original large wav files by
compressed versions.
Please note that during the last years significant improvements where made on the new instruments. Other manufacturers produce instruments of similar sound behavior.