Found something interesting on FB. Toucan posted this as a new main board for r/c tanks. Zipper, is this the one you are working with? I was interested in the listing of sounds, number 7 specifically.

7 sound effects: Leopard2 A6, Tiger II, Tiger I, Abrams M1A2, Walker Bulldog, StugIII, Panzer VIII, Maus.​

Click image for larger version Name: 323221140_714889476667103_1941551221799045683_n.jpg Views: 2925 Size: 77.2 KB ID: 366188
Click image for larger version Name: 324245124_5582069565235479_1579589320638928629_n.jpg Views: 2562 Size: 103.1 KB ID: 366189