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HELIX BOARD 12 PLUS
30. +4 / -10 Switch
This button, located on both stereo input
channels, is used adjust the input sensitivity of
the corresponding channels, which will adapt the
mixer to external devices which may use different
operating levels. If the input source is -10 dBV
(consumer audio level), it is best to engage the
switch, allowing the signal to be heard. The +4
dBu level is suitable for Professional Audio signals, which are
considerably higher than the consumer level. However, if you
are unsure of the source’s operating level, we suggest leaving
the switch disengaged until you test the source’s signal. You
can then engage if necessary (if the level of the input signal is
obviously too low).
Digital Effect Section
31. Digital Effect Display
This 2-digital numeric display shows the program number that is
currently applied to your EFX audio signal. When you rotate the
Program control, you can scroll through different program numbers.
The display will revert back to the original program if a new program
is not selected within a few seconds. For a list of available effects,
please observe the Digital Effect Table.
32. Sig and Clip Indicators
Located within the Digital Effect Display are Clip and Sig LEDs.
The Sig LED will light up when any signal is received by the effect
processor, and the Clip LED will light up shortly before excessive
signals are dynamically clipped. If the Clip LED lights up too often,
it may be advisable to turn down the AUX 2/EFX control on one or
all input channels to ensure the signal level is not excessive.
33. Program Control
This control is used to scroll through the various effects. Turning
the control clockwise will allow users to ascend into higher program
numbers, and turning it counter-clockwise will allow users to
descend into lower program numbers. Pushing this control will
apply the new effect. When a tap delay effect is selected, pressing
this control will allow users to select the tap-delay time. By pushing
the button several times, the effect processor interprets the time
between last two pushes and remembers this as the delay time
– until the button is pushed again. This is kept (even after the
power is turned off). When the tap delay effect is selected, a
small LED will flash within the digital effect display window at the
selected intervals.
Master Section
34. AUX Stereo Return Controls
These controls adjust the signal level of audio fed through to
the AUX Stereo Return inputs, which will be added to the MAIN
L-R mix. The AUX Return 2 control also acts as a level control
for the EFX processor when no device is plugged into the AUX
2 Return inputs.
35. EFX to Monitor Button
This button allows users to select the destination of the AUX
Return 2 signal. Pushing it in sends the signal to the AUX Send
1 mixing bus.
Hint: Use this button to send your EFX signal to the AUX 1 mix. You can
then send your AUX 1 and 2 mix to the computer as your additional stereo
mix. This will allow you to record your EFX!
36. AUX Send 1 Master Control
This control will adjust the final output level for the AUX send
output, the signal of which is taken from the AUX 1 controls on
each input channel.
37. USB Source Select
This switch determines which of the Helix Board’s signals will be
used for the 9th and 10th channels sent through the USB interface
to the computer. Users can choose to send the stereo signal from
AUX 1/2, ALT 3/4 or the Main mix through the USB interface.
38. USB Trim Control and Indicator
This trim control can be used to adjust the level of the outgoing USB
signal from channel 9/10 (which will be received by the computer).
If the input signals received by your computer are noticeably
excessive, using this control could help to attenuate the signal to
an acceptable degree. The accompanying LED will illuminate when
a connection is established through the USB interface.
39. Control Room Buttons
Engaging any of these four buttons will enable you to use the
signal from any of the corresponding sources to send to the Control
Room mixing bus and the LED Level Meter for level monitoring.
For instance, pressing USB & 2T Rtn button will allow you to send
the 2 Track Return signal and the signal received through the USB
interface to the Control Room Outputs (the level of which will be
visible on the Level Meter), where as the Main L-R will allow you
to use the Main Left/Right signal, the AUX 1 allows you to use the
AUX 1 signal, and the ALT 3-4 allows you to use the “Alternate”
stereo mix bus signal. You can even use a combination of all these
signals, if need be.
