http://simulations.narod.ru/ Simulator of vibrating string with possibility to set different parameters include initial positions, velocities, distributed friction. Solved as 1d wave equation with friction with FDM method. It is possible to plot graph, spectrogram, animated graph, listen stereo sound and realtime. Move markers with mouse.
Option realtime video and audio possible if daq toolbox instlled. Option spectrogram is possible if signal processing toolbox installed.