Rocktron Velocity VH 160 R - Manual (Page 8)

AGX THRESHOLD control and ACTIVE LED - detailed description :
This knob allows you to control the “dynamic attack” of the noise reduction. In other words this control
may be set to either eliminate the standby noise (distortion “ON” with guitar volume “OFF”) or place the
AGX in a hard gating attack (useful for heavy hand muted staccato chording). Generally when playing, the
AGX ACTIVE LED will be “OFF.” The AGX ACTIVE LED will turn “ON” (or light) when the signal
crosses the THRESHOLD set by the user.
AGX HARD GATING
To set the AGX control to “HARD GATING”, follow these steps. Please note that the AGX in the hard
gating mode is very sensitive and user dependent. It is a tool that you will need to experiment with to fit
your personal taste.
1. Adjust AGX knob full counter clockwise (Full LEFT-OFF).
2. Plug your guitar into the amp and adjust the distortion and volume to your taste.
3. Turn the volume on your guitar FULL UP.
4. While muting your strings with your hand turn the AGX knob to the right until you
hear the noise clamp off.
Now you can do very “heavy distorted chord chunking” and then mute to silence by muting your strings....
You may need to adjust the knob then stand away from the amp to find the exact setting you want if you are
close to the speakers. You may try a combination of rolling back your guitar volume just a little 1/8-1/4 of
its travel and leaving it there to get the best dynamic response. Once again this setting will be different from
user to user so experiment to find “your” sweet spot.
AGX (Automatic Gain Expander)
Rocktron’s patented AGX system solves the long standing problem encountered by guitar players when
using high gain distortion. The AGX circuit expands the gain of the amplification circuit only when required
based on the input level. When no signal is present, the AGX circuit expands down the amplification level to
a point where hum and noise are dramatically reduced.
AGX PREAMP NOISE REDUCTION
To set the AGX for noise reduction, follow these steps:
1. Adjust AGX knob full counter clockwise (full LEFT-OFF).
2. Plug your guitar into the amp and adjust the distortion and volume to your taste.
3. Turn the volume on your guitar “OFF.” What is left is the noise produced by the ultra hi-gain circuitry of
the preamp.
4. Turn the AGX knob to the right slowly until the preamp noise is gone.
With this setting you can go directly to silence just by rolling your volume “OFF” on your guitar.