Ron,
Don't get confused about the term " chords" when we speak of them being used in playing the accordion.
The term is not refering to the same use, as in playing guitar. I suppose that it be less confussing if we used the term "blends" instead. Technicaly, they are chords, but when we use them in the melody of the tune, they are not being used as an accompliment to another lead instrument and probably would more correctly be called "blends".
They are used when playing the melody of the song and are a substitute for, the single note of the melody at that point and time of the tune.
Hope you understand what I'm trying to say here.
Jude

Thanks Jude, This explanation helped me a lot. I now understand. I can stop trying to play rythum guitar on my accordion. Whew! I thought I was missing something. By the way, I have a Falcon, Martin, and Bon Temps and routinely play the Bon Temps because of the sound and the key board action and response. You seem to have just the right measurements on the keyboard for quick action.

Jude,
Thanks for the information.
I think that I understand it now.
In my former band I play also banjo and there I play chords(when someone is singing) like you say on the guitar.
On the accordion I play the chords/blends when I'm playing a melody of a tune.
I use the buttons that are mentioned in an earlier item.
I'm getting more knowledge every day on this forum.