Phase Reverse Switch; Db Pad; +48V Phantom Power Switch; Digital Output Section - DigiTech VTP1 Owner's Manual

PHASE reversal switch
You can invert the phase of the incoming signal. This may be required when you have two mics
coming into both channels of the VTP-1 and the distance between the mics is at a critical point
where they cause frequency cancellation. Flipping the phase of one of the input channels can
overcome the notchy, comb filtering effects caused by multiple mics on a single source.
20 dB PAD switch
This inserts a gain reduction circuit into the signal path from the microphone input. The pad is
inserted before the signal is passed on to the tube and it is used to prevent overload distortion
from high output microphones.

+48V phantom power switch

This switch activates phantom power for condenser microphones on pins 2 and 3 of the XLR mic
input. Connect your microphone to the VTP-1 before turning on the phantom power. This will
prevent high voltage arcing that may damage your mic.
WARNING: Do not connect unbalanced sources to this input. The voltage on these pins
is sufficient to cause damage if connected directly to a transducer.

DIGITAL OUTPUT Section

FORMAT Switch

The FORMAT switch selects between the industry-standard AES/EBU and S/PDIF stereo dig-
ital audio formats. You should set this switch to the same format as the one your receiving
device requires.

SAMPLE RATE Switch

When using the digital output, the VTP-1 becomes the master clock device and as such, deter-
mines the clock frequency (sample rate) for any digital devices connected to it. You have the
choice of 44.1 kHz which is the standard for Compact Disc duplication, and 48 kHz, which is
the sample rate for many DAT machines. If your recorder allows you an option, you are better
off to stay with 44.1 kHz if your recording stands any chance of being duplicated on CD. If
you have recorded a project at 48 kHz and will be putting it out on CD, you will require sam-
ple rate conversion that may effect the sound of your recording.
Your recorder should automatically sense any change in sample rate even when no audio is
present. If it doesn't, you will have to set it manually. You must also ensure that your recorder
is set to synchronize its sample rate to an external digital device.
9
••• •••