Front Panel; Post Trim; Pre Gain - DigiTech VTP1 Owner's Manual

Front Panel

POST TRIM Control
This control determines the output level presented at the analog and digital outputs. This and the
PRE GAIN control work together to allow you to dial in the amount of tube saturation you would
like while maintaining a nominal output level.
NOTE: The POST TRIM control should generally be set to the fully clockwise position
unless you want tube saturation.
A reduction in POST TRIM level will reduce the amount of VU meter deflection.
The POST TRIM is an attenuator-type control in that it does not add gain when it is turned all the
way up. Bring up the PRE GAIN control until the meter needle deflects with no clips registering
on the CLIP LED.
You'll want to reduce the output level with the POST TRIM control when the analog output of the
VTP-1 is connected to a semi pro mixer or recorder with -10dB input sensitivity. The output level
should be reduced because the VTP-1 has sufficient output level to cause distortion.
PRE GAIN Control
This determines the amount of gain the tube amplifier will apply to the input signal. It is also used
to adjust the input sensitivity to -10 dbv and +4 dBu signals. There is up to 66dB of gain available
to amplify even the weakest of microphone signals and up to 26 dB for the line inputs. As you
increase this gain control you will increase the amount of tube saturation that, in moderate
amounts, enhances pleasant, even-order harmonics, but in greater amounts, can cause audible dis-
tortion.
If you have the PRE GAIN control set to a level causing tube saturation, you will need to bring
the POST TRIM level down so as not to overdrive the outputs.
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