Cadac CDC four - Manual (Page 49)

Revision 1 2012-13 CDC FOUR
49
FX sends and returns
The two FX channels in the CDC FOUR differ from the other channel types in
that they are entirely internal to the mixer and have no external signal inputs or
outputs.
As shown in the channel descriptions above, all mono and stereo input channels
are able to send to the two internal FX busses, FX 1 and FX 2, via the dedicated
controls on the CAM, or their virtual on-screen equivalents. The signals on the FX
busses are summed in the normal way (though wholly in the digital domain) and
may have EQ and dynamics applied in the same way as other types of channel. The
signal is then passed to a DSP FX processor, which can add time-domain effects
such as reverb and delay. (See “FX processing” on page 58 for more details of
the effects themselves). The processed signal (now in stereo) is then available to
be fed back into the mix (and elsewhere) via the two FX return faders FX 1 and
FX 2; these are faders 13 and 14 in the OUTPUTS layer. This process is exactly
analogous to patching in an external FX unit to an analogue mixer, where an
Aux send would be used to send a signal from one or more channels to the FX
unit, and the unit’s output would be brought back into the mixer via dedicated FX
returns or spare channels as available, or desired.
The CAM and the TFT display are available to an FX channel when the OUTPUTS
layer is selected. Pressing the SEL button above one of the faders assigns the
FX channel to the CAM and screen.
On the CDC FOUR, the FX channels have an almost identical set of controls to
a mono channel, although they are treating a stereo signal; this includes EQ,
routing and Aux sends. For this reason, only the differences from a mono channel
are summarised below. The description of the mono mic/line channel applies in
all other respects. Refer to Page 32 onwards for full details.
Input stage:
All input functionality is removed. The Input Trim, high-pass filter and phase
controls are inoperative and their virtual counterparts do not appear on-screen.