Antex Electronics SX-5e - Manual (Page 35)

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“Radio pushbutton” controls G, H, I, and J determine the record
source. Only one button on at a time is allowed. It may seem
strange that button J will set the record source to Line Out. This
is done to allow the use of attenuators C, D, or E to control the
record level. Using Line Out as the record source will also allow
you to record a mix of all 3 input sources if desired. Note that if
buttons G, H, or I are used to select the record source, Sliders C,
D, or E will NOT control the record level. In order to use these
sliders, the record source must be set to Line Out, (button J On).
When doing this, be sure Slider K is all the way down. Otherwise,
there will be a feedback path which will cause undesirable re-
sults. The disadvantage of using Line Out as the record source is
that you will no longer be able to directly monitor the recording.
You will still hear the source material you are recording on the
Line Out, however this is before the actual recording has been
done. What you are hearing has not gone through the A/D and
D/A. So, if you have set the recording level too high, and the A/D
is distorting, what you hear on the Line Out may sound fine. To
monitor the actual recording, it is necessary to select the record
source using buttons G, H, or I and set the record level with an
external device before the signal gets to the Antex Card. The
actual recorded signal will then be available using the Play 1
Slider, K. (Note that direct monitoring does not operate for MPEG
format with sample rates greater than 32 KHz.)
Play 1 and Play 2 Sliders, K, and L control the level of the files
being played back. Note that these sliders operate in the digital
domain. They amount to multiplication routines in the DSP which
take the signal level and multiply it by a scaling factor between 0
and 1. This is important to note because using these sliders as a
master volume control will degrade the signal to noise ratio. This
is because using these controls lowers the signal levels while
leaving the noise floor unchanged. These controls are intended to
mix 2 playback files together, or to fade a file up or down at the
beginning or end, not as a master volume control. Best signal to
noise ratio will be achieved by setting Sliders K or L to maximum
and controlling the volume using the master volume control on the
external amplifier or mixing board the Antex Card is connected to.
Set the Trim Control (B) to +8 rather than setting Sliders K or L