LFPar 

- a sine-like shape made of two parabolas. has audible odd harmonics.

{ LFPar.ar(LFPar.kr(LFPar.kr(0.2,0,8,10),0, 400,800),0,0.1) }.play

{ LFPar.ar(LFPar.kr(0.2, 0, 400,800),0,0.1) }.play

{ LFPar.ar(800,0,0.1) }.play

{ LFPar.ar(XLine.kr(100,8000,30),0,0.1) }.play

compare:

{ LFCub.ar(LFCub.kr(LFCub.kr(0.2,0,8,10),0, 400,800),0,0.1) }.play

{ LFCub.ar(LFCub.kr(0.2, 0, 400,800),0,0.1) }.play

{ LFCub.ar(800,0,0.1) }.play

{ LFCub.ar(XLine.kr(100,8000,30),0,0.1) }.play

{ SinOsc.ar(SinOsc.kr(SinOsc.kr(0.2,0,8,10),0, 400,800),0,0.1) }.play

{ SinOsc.ar(SinOsc.kr(0.2, 0, 400,800),0,0.1) }.play

{ SinOsc.ar(800,0,0.1) }.play

{ SinOsc.ar(XLine.kr(100,8000,30),0,0.1) }.play

{ LFTri.ar(LFTri.kr(LFTri.kr(0.2,0,8,10),0, 400,800),0,0.1) }.play

{ LFTri.ar(LFTri.kr(0.2, 0, 400,800),0,0.1) }.play

{ LFTri.ar(800,0,0.1) }.play

{ LFTri.ar(XLine.kr(100,8000,30),0,0.1) }.play