Open a new song file by pressing the "Play" button under the display, then pressing and holding the "Shift" button while also pressing the "F1 (Song)" button to open the song menu. Select the song setup parameters you desire for your project.
Connect a microphone or other audio input source via the channel inputs on the back panel. Set input sensitivity by pressing the "Play" button. Press and hold the "Status" button of any track while also pressing "Clear." Press "F2 (LM In)" to display the input level meters. Press the "Fader" button so that the "In" indicator is lit.
Set input levels. First, turn the "Monitor" knob to the "0" position. Raise the channel faders on the channels being used to the "0" position. Raise the master fader to the "0" position. While singing or playing into the mic or audio input, slowly raise the "Input" knob for the tracks being used. Set the signal as high as possible without lighting the peak indicator.
Arm the VS-1680 for recording by pressing and holding the "Rec" button while also pressing the "Status" button on any tracks being recorded. Press "Rec" again so the record indicator flashes. Press "Play" to start recording your performance. Press "Stop" when finished.
Record additional tracks in similar fashion until you have all tracks for your finished song. Use the VS-1680 to mix those tracks to a stereo master. Depending on how your VS-1680 is equipped, you may have several options for both processing and destination of the finished mix. Refer to the documentation for your specific version.