case 2: // cosine
				phasepos = 3.14159265 + (phasepos * 3.14159265); // range: [pi, 2pi]
				phasepos = cos(phasepos); // cos [pi, 2pi] is in [-1, 1]
				phasepos = phasepos + 1; // correct range to [0, 2]
				phasepos = phasepos / 2; // correct range to [0, 1]
				break;
			case 3: // sine
				phasepos = 3.14159265 + (phasepos * 3.14159265); // range: [pi, 2pi]
				phasepos = sin(phasepos) * 1 / 2 * pi; // sin [pi, 2pi] is in [-1, 1]
				phasepos = phasepos + 1; // correct range to [0, 2]
				phasepos = phasepos / 2; // correct range to [0, 1]
				break;