What yet exists
Read and save WAV format files
MDI (multiple documents interface) You can open as many window as you want.
Copy/paste a Selection .
Sound Recorder .
Wave Synthetiser (square, sinus, saw, triangle and manual drawing).
Resampler (to change frequency, number of channels, etc.)
Fade-In, Fade-Out, Silence, Invert .
Filters: brilliance, derivative, volume, DoubleSpeed, Tremolo, StereoExpand, Echo .
Zoom horizontal and vertical.