The VS-1680 features 6 Balanced (TRS) INPUT jacks, each one configured as follows:

2 TIP HOT
3 RING COLD
1 SLEEVE GROUND

However, some audio devices have the opposite HOT (TIP) and COLD (RING) configuration. Using such equipment as is may result in poor sound placement, disintegration of the left-right balance, and a loss of the separation between
left and right sounds when using stereo inputs. In such instances, you need to switch the phase of each channel as follows:

1) Press the SELECT button for the Input or Track channels whose phase you wish to switch.
2) Press F3[Phase]. If "Phase" does not appear above F3, first press PAGE until "Phase" is displayed, and then press F3[Phase].

Phase: This selects the phase (NRM, INV) for each channel. Usually NRM is selected.
NRM: Normal phase (same as the input)
INV: Inverted phase (Opposite phase)

3) Use the VALUE dial to select the desired setting.
4) Press PLAY[DISPLAY] to return to the previous Play condition.