Yamaha P-37E

Yamaha image of the keypad strip, an innovation of which in the P-37E is the differentiation of the size and shape of the holes through which air is released. The bass end holes are shown on the right. On the P-37D, all holes are of that same shape and size. It seems that one effect is muting and another is the requirement of more air pressure at the high end.

My Hybrid

Through experimentation, I have determined that I get the best performance by transplanting the body of my P-37D into the enclosure of the P-37E. Notice the color of the moisture release button. I personally prefer the sound of the E, which is more muted than that of the D. The muting is mainly effected by characteristics of the E's enclosure., whose looks and feel I strongly prefer to those of the P-37D.