User manual

3 - Controlling AmpliTube™ LE
18
Controlling AmpliTube™ LE
Input Level
The input signal level (fig. 9) is very important in AmpliTube™ LE because
the preamplifier stages are physically modeled after real circuits, where the
signal level affects the timbre that’s being produced.
Always check the three LEDS labeled “ Input Level” on the left top corner of
the interface.
yellow shows that a too little signal is present
green indicates that the signal is OK
red which should light only occasionally, showing that the input is
close to overload.
AmpliTube™ LE does not have an “input level” knob, because it’s very
important that the level is actually good at the audio input of your computer.
If the level is too low, the input the A/D converters of your audio interface
will work with a lower resolution and the sound will not be as good as it
could be, if it is too high there will be clipping even with AmpliTube™ LE
clean settings.
During normal playing the green LED should be the one that lights most
often. If the yellow one lights most often then increase the gain of your
preamplifier or audio interface; if the red one is blinking reduce it slightly.
Gate
The very first stage of AmpliTube™ LE is the noise gate (fig. 10).
It is an ultra-fast noise gate that is able to cut the input of AmpliTube™ LE
when the signal is lower than a certain threshold. This eliminates the noise
background typical of guitar pickups / preamps when an instrument is not
playing.
It is very useful at high gain settings because, being placed before the
amplifier, it can effectively clean up the signal during the silent parts of the
performance.
Begin by setting the Gate knob fully counterclockwise. This completely
bypasses the Gate, because the threshold is set at the minimum, which is a
very low signal level.
You can check the Gate action by watching the red LED positioned near the
Gate knob. When the Gate closes the LED lights. During normal play the LED
should always be off, and should light only when the strings are not vibra-
ting, showing that the gate is closed.
Chapter 3
3.1
3.2
fig. 10
fig. 9