Audio download options allow users to select an audio quality at which to download, specified by Bitrate.
Customisable Audio Options were introduced in version 3.1147 of Asset Bank - previous to this there were three hard-coded options for Low (96kbps), Standard (128kbps) and High (256kbps). These are now supplied as the default options.
Asset Bank comes with the default download options described above. To customise the audio download options go to 'Download Options' in the Admin menu and then click on the Audio Options tab.
Note that the bitrate should be entered in bps, so for example enter 128000 for 128 kbps. You should also enter a label for each option, which will appear in the selector on the Download Audio screen for the downloader.