One of the most comfortable methods to compose music is to work with loops. Sony ACID Pro is one of the best alternatives to perform this kind of work, mainly because it allows the user to modify any element of the loop separately, this means, without affecting the other parameters.
Sony's audio sequencer
This sequencer offers compatibility with VST plug-ins, insertion of MIDI tracks, recording by means of any sound input method of the sound card and manipulation of any clip from the program's main window.
One of the most striking features of this tool is that it's possible to modify the tone of any sample, without it affecting the length nor the formant, which makes things much easier for any musician that wants to create the general outline of a song in a couple of minutes.
If you still don't have a sequencer that offers good sound, as well as making it very easy to handle samples and to mix audio, you should try out Sony ACID Pro, a practical and stable tool.