Are Duet Concertina Systems "Convertible"? (Amateur repairs/buying question)

[LR71]

Hayden actually developed his system by taking a Jeffries duet and moving reeds around.  As it happens it worked.

 

Being a player of jazz tunes on the "free bass" accordion (left side is single notes instead of preset chords) I bought a Jeffries duet, having read that they're suitable for complex chording.  I don't find this daunting or forever baffling - the shapes of guitar chords are rather off the wall, too.  You memorize chords and scales, and after a while it gets lodged into memory.

 

What really helped, interestingly enough, was to stop looking at the keyboard layout.  But then I'm an ear learner.

 

Some jazzy Jeffries players:  The World in a Box fellow is great, and plays quite a few jazz tunes.  There's a husband and wife on YouTube, she sings and he provides backing.  Sorry I can't remember their names.

 

I picked up my Jeffries Bros for cheap - only $3k.  This is a spendy instrument.  I'd save up and get an inexpensive hybrid, dip your toes into the water.