Don, the tutorial videos explain how the size reqd depends on the song quality settings. You can work out how many megabytes are reqd for each minute of track, so you can multiply this by the no. of tracks to get the total size reqd. If you want to do the sums yourself, a 24-bit 48KHz song needs (3 x 48000) bytes per second for every mono track (double this for stereo). A 16-bit 44.1KHz song needs (2 x 44100) bytes per second.
AudioDepot is only used for exporting/importing tracks to/from a computer. The file sizes here should equate to the above, but they aren't actually used for the song so can be deleted to make more space.
The space used by the current song is shown in Menu, Information, along with how much free space is available on the card. You can also see the sizes for all songs in the song list when you press Menu, Song. The final column can be cycled through the size and quality settings by pressing one of the Function buttons.
The time remaining shown at the top of the Home screen is only meaningful when you arm at least one track, so if you arm all the tracks you are going to use, this will be an accurate estimate, allowing for the limit on each track which is imposed by the way files are stored on the card - no file can be larger than 4GB so no matter how much space you have, this will limit the length of each track. If you do not arm any tracks, the time remaining value is just based on the above calculation and assumes one mono track with no size limit, so will usually be a much higher value.
