VT RTA-168A/B Manual Rev. 1.5
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Adjustment of Input Gain via Software
Same as Windows 7
1.5.5 Adjustment of Input Gain via Hardware Gain Switch
You can also adjust the input gain by changing the switch position on the XLR-to-USB
sound card. You can change among three positions: HI, MED, LO (see figure above). The
MED and LO positions provide roughly 5dB (×1.778279) and 9.56dB (×3.006076)’
attenuation with respect to the HI position (×1). The accurate gain differences are provided in
the sound level calibration data in the product package.
If the input gain is adjusted through the software, the software will automatically take the
change of the input gain into account. However, if the input gain is adjusted through the
hardware gain switch, you will have to change the “Probe” switch position (see figure below)
accordingly in Multi-Instrument’s toolbar to account for the change. Note: The hardware
gain switch positions: HI, MED and LO correspond to “HI”, “MED” and “LO” in the
“Probe” switch position combo box respectively. For example, if the hardware gain switch is
at LO, you must choose “LO” in the “Probe” switch position combo box.
