On their website, it boasts:
- WYSIWYG, notes are entered on a "virtual note sheet"
- Unlimited number of staves
- Up to four voices per staff
- Easy and fast note entry with your keyboard, mouse, or MIDI keyboard
- Integrated sequencer and FluidSynth software synthesizer
- Import and export of MusicXML and Standard MIDI Files
- Available for Windows, Mac and Linux
- Translated in 35 languages
- GNU GPL licensed
They seem to have a pretty comprehensive tutorial on youtube.
I've just downloaded it, and hope to give it a run in due time. For those of you who have used it, do feel free to share your views in the comments section.
Jeremy