FMTriangleWave = function(a, b, c, d, e) {
            if (typeof c == "number") {
              if (e !== undefined) {
                AbstractWave.call(this, a, b, c, d);
                this.fmod = e;
              } else {
                AbstractWave.call(this, a, b, c, d, new ConstantWave(0));
              }
            } else {
              AbstractWave.call(this, a, b, 1, 0);
            }
          }
@module toxi/math/waves/FMTriangleWave
@augments toxi/math/waves/AbstractWave