With Nero ScratchBox you can insert an audio clip in the track. You can open the Nero ScratchBox window via the Insert > ScratchBox Clip entry in the menu bar.
Nero ScratchBox consists of two virtual turntables (1) on which audio files can be played. This means e.g. that you can professionally mix the audio files in the mixing console area (3), process the audio files with various effects in the tools area (5), and scratch the audio files.
You can select the files that you want to play on the turntables in the file selection area (4). The familiar Windows folder structure is shown here. In the peak file view (2) the audio file is displayed as peak file.