"By using the limiter when recording microphone sound, the signal level is
prevented from exceeding a certain level. In result, the signal level fluctuation
is suppressed. You can activate the limiter channel by channel, by setting the
[LIMITER] switch to “ON”.
The PD-6 limiter uses the VCA (Voltage Controlled Amplifier) circuit. By
default, the threshold is -12 dB under the 24-bit full-scale level (all bits are
on) and the compressed ratio is 1:3. The limiter attack time is fixed to 20 ms,
while the release time is fixed to 150 ms.
You can set the threshold and level for each channel individually using the
“Limiter parameter” menu in the Setup mode (see “Chapter 7: Setup mode”
on page 98 for details)."
Try not to use the limiter if at all possible, as they're usually audible and of poor quality compared to a rack-mount or software-based limiter. If your recorder allows it, mono-sum the channel to both channels and dial one of the two channels down -10 to -20db lower than the other. This sets you up a safety track incase your hot channel overloads, still giving your audio editor audio that isn't overmodulated.