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4.4.4 Message Area
Directly below the Master and Slave radio buttons on the left side of the main
panel is a message area. Short text instructions to the operator, status
indications, or error messages can appear in this box. A listing of possible error
messages appears in Chapter 5, along with an explanation of the errors.
4.4.5 Line Input Volume
The line input volume section of the main panel consists of two identical boxes,
one each for the left and right input channels. Each box contains the following:
- A level bar that indicates the volume level. To set the volume, click at the
desired location; the length of the bar adjusts to that point, changing the
volume level accordingly.
- A Mute check box to silence the channel
- A Gang check box to tie the volume controls of both channels together.
The channel that has its Gang box checked automatically locks the
opposite channel into a volume setting the same as its own.
- A display area with a numeric readout of the actual gain level setting in dB
Left and right line input volume settings can also be changed in the L Vol (Line
Input) and R Vol (Line Input) registers on the register panel (see Section 4.6.2
and Section 4.6.3, respectively).
4.4.6 HeadPhone Volume
The headphone volume section of the main panel consists of two identical
boxes, one each for the left and right audio channels. Each box contains the
following:
- A level bar that indicates the volume level. To set the volume, click at the
desired location; the length of the bar adjusts to that point, changing the
volume level accordingly.
- A Zero Cross check box. When the zero-cross detect circuit for the
headphone is enabled, the volume control values are only updated when
the input signal to the gain stage is close to the analog ground level.
- A Gang check box to tie the volume controls of both channels together.
The channel that has its Gang box checked automatically locks the oppo-
site channel into a volume setting the same as its own.
- A display area with a numeric readout of the actual gain level setting in dB
Left and right headphone volume settings can also be changed in the L Vol
(HeadPhone) and R Vol (HeadPhone) registers on the register panel (see
Section 4.6.4 and Section 4.6.5, respectively).
4.4.7 RESET Button
The RESET button sends an I
2
C reset command to the AIC23/DAC23.
4.4.8 EXIT Button
EXIT closes all files. The EXIT button can be clicked at any time.