From NCH Software:
WavePad is an audio editing program for Windows. WavePad allows you to create and edit voice, music and other sound recordings. You can duplicate sections of recordings and add echo, amplification, noise reduction and other effects.
WavePad features include: auto-trim, voice-activated recording, cut, copy, paste, delete, insert, silence, autotrim, noise reduction, click pop removal and more. Special effects include reduce vocals, distortion, chorus and more. Batch processing allows you to apply effects and convert multiple files as a single function. This audio editor supports sample rates from 6000 to 96000Hz, stereo or mono, 8, 16, 24 or 32 bits, and pre-defined sound quality suggestions when saving files such as CD Quality and Radio Quality. Advanced tools include sound spectral analysis (FFT) and more. Load sound files directly from CD and work with multiple files at the same time in separate screens.