TL:DR; Listen to your work when you want!
Let the computer read your documents so that you can listen to them later.
Emicsoft MP3 to M4R Converter let you experience the music life with easy operation steps and high quality. You can convert mp3 to m4r, wav to m4r,and more audio files supported AAC, AC3, AIFF, AMR, AU, OGG, WAV, etc.
AudioRetoucher is an audio effect processor that changes the pitch and tempo of an audio files. the sound of an instrument or voice might be modified slightly, to make a vocalist or instrumentalist's job easier in dealing with difficult keys.
Sonarca Sound Recorder XiFi is a studio quality sound recorder. With this high-definition MP3 recorder, you can easily record various sound input to dozens of audio formats such as MP3.