Thanks for all of your input. I'm definitely going to upgrade to 30 buttons

Would someone be able to link me a good one on ebay? I want to make sure I get a good one and nobody in my geographical region really plays

I leanred the song Paddy West off of Blow Boys Blow by maccoll and Lloyd but I cant recreate the chords in the verses, I can only do the simple melody. Good for accompanying other instruments I guess but I mostly play alone