Magix Sound Forge Pro is a professional product to edit your own tracks and audio samples very quickly when needed, it can be the best (and cheapest) choice for you.
Its extremely intuitive interface is perfect for amateurs and everyone that needs to edit sound in one touch, rather than composing and rendering a professional track. Import your sample file, cut and split its audio waveform, change its playback rate, adjust its volume and apply fade transitions.
From the Plug-In Chooser, browse and apply the proper Audio Effect from the long list, and draw your own envelope line to make the effect change in time as you like. One of the best products from MAGIX company dedicated to Audio Editing.