Hi Daisy, I'm just passing through so this advise will be quick. You'll find squillions in music collections from before WWII where the piano arrangements are really rich with lots of jazz chords for quite familiar songs. They'll be listed above the treble clef in plain text such as "Eb dim". You should find enough at your local library to get you started - the buskers' Fake Books often have good chord arrangements.

Try a few of these out to complement your ear training. You'll also see lots of augmented chords in these songs. Is this part of the standard 120 bass configuration? Well done with your pursuits - it's a joy to hear good/alternative chords played on a box.

Regards, John