There are four rows with three buttons on each row. Toggles between the track Program screen and the Volume screen. Compare The Compare button changes function depending on what mode you're in. If you decide you like your edits, then you can store them in memory where they stay when the power is off. The column of buttons on the far right are labeled as a group called SEQ, for sequencer.
Details are on the Keys Page.
Click here to go there. Although technically not a front panel control, that' s where the floppy is mounted. The 01 can write to the disk in different formats, depending on which version of the ROM you have installed. Click to visit FDD page for more details on the floppy disk drive. That means we cover the jacks first.