It meets all your needs for audio editing. Audio Editor Master is a professional digital audio editor; it allows you to perform various operations with audio file: cut, copy, and paste features (with unlimited undo functionality), mix tracks, or apply effects to recordings.

This program can not only record and play sounds but also import and export a wide range of supported audio files (WAV, AIFF, MP3, and OGG, etc.). Audio Editor Master offers a customizable spectrogram mode and a frequency-analysis window for audio-analysis applications.

Audio Editor Master Features:
1. Digitize a sound recording and save it as supported formats.
2. Real-time visuals: bar, waveform, spectrogram, spectrum, level meter, etc.
3. Record audio data from a microphone or any other available input device.
4. Display a waveform window of an audio file and apply zooming.
5. Edit audio files visually (Cut, Copy, Delete Selection, Delete Silence, Paste, Mix Paste, Mix From File, Edit Channel).
6. Apply various effects (Amplify, Compressor, Delay, Fade In and Fade Out, Flanger, Invert, Normalize, Phaser,Reverb, Reverse, Silence, Stretch, Vibrato, etc.).
7. Apply different filters to any selected portion of audio files (BandPass Filter, HighPass Filter, HighShelf Filter, LowPass Filter, LowShelf Filter, Notch Filter, Peak EQ Filter).
8. Insert noise or silence.
9. Save an audio file as the other format.
10. Use markers to locate the selected part or special part of the audio data.
11. Add and edit extra information to your audio files (Album, Artist, Comments, Copyright, Genre, Title, Year).

Limitations:
* 20 uses or 30 days trial
* The save function is disabled

The license of this software is Free Trial Software, the price is $29.95, you can free download and get a free trial.