Mach Speed Technologies TRIO A1000 - Manual (Page 11)

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on in the empty space, and select Paste. This will transfer the song
on to your MP3 player.
8. Repeat step 7 for as many songs as you want to copy on to the unit.
NOTE: MAC Computers
When connected to your MAC computer, the device will act as a
removable drive. Simply drag your MP3 files to the device.