I really love playing with all the strings at D : that is the three thinner strings at the D below the E ( first string ) on a guitar or the same D as the first string of a 5string banjo and the thicker string at the D the same as the fourth string of a guitar or fourth string of a 5 string banjo. . This tunning I have always called " Bagpipe tuning" cause of the way ot sounds. I use both a noter or chording with this tuning .. The one thing I do look for on a new duncimer is good tuners cause you will want to try a few different tunings before your through .. Good luck and have some fun with it .. All the best , Guy