Not Cajun Enough

[BellowBoy]

My first "accordion" (more like an antiquated decoration) was a dilapidated Beaver Brand accordion. I have been playing with the tuning knobs and It has similar tuning to a Cajun accordion but I can't quite get it to sound Cajun enough. It only has three knobs at the top and from what I've gathered four knobs are what give Cajun accordions their unique sound. Just curious if there's a way
(This is the same brand and make, mine is actually playable but otherwise identical)

 

[Big Squeezy Accordions]

My first "accordion" (more like an antiquated decoration) was a dilapidated Beaver Brand accordion. I have been playing with the tuning knobs and It has similar tuning to a Cajun accordion but I can't quite get it to sound Cajun enough. It only has three knobs at the top and from what I've gathered four knobs are what give Cajun accordions their unique sound. Just curious if there's a way
(This is the same brand and make, mine is actually playable but otherwise identical)

Cajun accordions (or melodeons, as the Brits say) have 4 reeds - low, middle, middle, and high. Nowadays they are usually tuned dry, so no tremolo, though this was not always the case. Also, the 3rds of the tonic and dominant (E and B in a C box) are tuned just - about 14 cents flatter than equal temperament. Some tuners will supposedly tune the 4th (F on a C box) sharp to make a just 3rd on the subdominant, though this is less common and I haven't seen it personally. Of course, the left hand chords should also be tuned just.