I have made some improvements to my waveform node. It now runs faster, can place waves along any baseline, fixes a subtle bug with sawtooth waves, and facilitates two forms of animation.

Waveform now takes 7 parameters:

• Baseline. A line segment at any position and angle that defines where the waves will be drawn
• Min. Minimim Y value
• Max. Maximum Y value. Together, min and max define the initial amplitude of the wave,
• Period. The period of the wave
• Type. Wave type: Sine, Square, Triangle, or Sawtooth
• Amplitude %. Modify the amplitude. !00% leaves existing amplitude in place. A value greater than 100% magnifies it, a value less than 100% reduces it, 0% produces a flat line, and less than 0% reverses the polarity. In animations you can create a standing wave by fluctuating this value between 100% and -100%
• Travel. Amount to shift the wave in pixels to the left or right. Steadily increasing this value in an animation creates a traveling wave. For seamless loops set maximum travel rate to an even multiple of the wave's period.

The attached demo shows the four wave types slightly askew. If you export it as a movie, the waves will both travel and fluctuate, looping every 100 frames.

Movie attached. Set it to loop to see continuous motion.