When transferring music Swinsian can automatically convert tracks in incompatible formats into ones supported by iPods. To enable this, open the 'Devices' tab of the preferences and check the 'Transcode files when transferring to devices' checkbox.
It is possible to set Swinsian to convert files to different formats or bitrates, depending on the type and bitrate of the source file. These rules can be set in the 'Devices' tab of the preferences window. Click the plus button to add a new rule. Rules are tested in order, starting with those at the top, and the last matching rule is the one that is used. If no matching rule is found the track is transferred unaltered, if the filetype is supported, or not at all.