This visual aid was developed by Jim Coleman, Sr. to make it easy to see where the partials line up for the two notes of an interval. The cardstock sheets are placed against the fallboard with the first partial marks above the two notes of the interval. By seeing where the partials coincide on the keyboard, it helps with not only understanding how the partials interact, but also makes it easier to learn how to listen for those partials. Instructions are printed on the pink card.
We obtained a handful of these from Jim Jr. while at the 2025 PTG Convention, and we're honored to be able to make these available again. Jim Sr. was a dear friend and mentor, and this brilliant creation of his has helped many students of aural tuning over the years.
Please note that the cards will be folded for shipping.