4) Call the reproduction/recording software used and
make the required adjustments for audio reproduc-
tion via the mixer or for audio recording from the
mixer (
→
software instructions). It will then be pos-
sible to operate the mixer according to chapter 5.2.
If there is
no sound
, check the following sound adjust-
ments of the operating system of the computer:
– Audio input and output must be correctly assigned:
If the USB interface is used for transmitting audio
data to the mixer, it must be selected as a sound
playback device (device for audio output).
If the USB interface is used for sending the master
signal to the computer, it must be selected as an
input device for sound recording (device for audio
input).
– The sound must be switched on.
– The corresponding volume controls must not be set
to minimum.
5
Operation
5.1
Switching on /off
To prevent switching noise, set the master control
MAIN MIX (24) to the left stop before switching on. The
mixer is switched on and off with the POWER switch
(25). When the unit is switched on, the POWER LED
(22) will light up.
If the mixer is not used for a longer period after
operation, disconnect the plug-in power supply unit
from the mains socket as it will have a low power con-
sumption even with the mixer switched off.
5.2
Mixing the audio sources
The following operating steps merely serve as an aid;
other procedures are also possible.
1) First make the following basic adjustments:
a) Set the control GAIN (7), the tone controls HIGH
(8) and LOW (9), and the controls PAN (11) and
BAL (13 and 15) to mid-position.
b) Disengage the two TAPE buttons (19 and 20).
c) Set all LEVEL controls (12, 14, 16) to the left
stop.
d) Set the control MAIN MIX (14) for the overall vol-
ume to approx.
2
⁄
3
of its maximum.
2) For optimum level control of channel 1, feed an
audio signal to the channel and advance the control
LEVEL (12) so far that the LED VU-meter (23) will
light up at 0 dB. The control should be advanced to
approx.
2
⁄
3
of its maximum. If it is advanced too far
or not far enough, adapt the input amplification of
the signal with the control GAIN (7). Then adjust the
sound with the treble control HIGH (8) and the bass
control LOW (9). The overload LED PK (10) should
shortly light up with music peaks, if at all. If it is per-
manently illuminated, turn back the control GAIN
and/or the tone controls accordingly.
Add the signals of the channels 2/3 and 4/5 with
the volume controls LEVEL (14 and 16).
Set the controls LEVEL of any channels that are not
used to the left stop.
3) Use the panorama control PAN (11) to place the
mono signal in the stereo sound for channel 1 and
the controls BAL (13 and 15) to adjust the balance
of the stereo signals for channels 2/3 and 4/5.
4) To feed the input signal of the jacks TAPE IN (17)
also to the mixed signal, press the button TAPE TO
MIX (20).
To feed merely the TAPE IN signal to the out-
puts, press the button TAPE TO MIX and set the
controls LEVEL (12, 14, 16) of the input channels to
the left stop.
5) By means of the LED VU-meter (23), adjust the vol-
ume of the master signal (total of all input signals)
that is sent to all mixer outputs with the control
MAIN MIX (24).
Usually there will be an optimum level control
when the 0 dB LEDs are illuminated and the PEAK
LEDs light up shortly with music peaks, if at all.
However, if the output level of the mixer is too high
for the following unit, control the master signal to a
lower level accordingly.
6) Adjust the headphone volume with the control
(21) and select the monitoring signal for the head-
phones with the button TAPE TO PHONES (19):
– When the button is not pressed, the master sig-
nal adjusted via the control MAIN MIX (24) will
be monitored via the headphones and indicated
via the VU-meter (23).
– When the button is pressed, the input signal of
the jacks TAPE IN (17) will be monitored via the
headphones and indicated via the VU-meter.
CAUTION
Never adjust the audio system and the
headphones to a very high volume. Per-
manent high volumes may damage
your hearing! The human ear will get
accustomed to high volumes which do
not seem to be that high after some
time. Therefore, do not further increase
a high volume after getting used to it.
10
GB
