Lexicon PSP 42 Operation Manual
13
The HI CUT button
activates the feedback low-pass filter. The corner frequency is
fixed at 4kHz and the filter roll-off is 6db/octave. When switched on, the high
frequencies of the signal are attenuated more than the low frequencies. This is
analogous to the high frequency absorption that is caused by wall reflection.
The FB INV button
inverts the phase of the feedback signal. While this is not
audible with a long delay time, it can dramatically alter the sound if the delay time
is short. To avoid clicks that would have inevitably occurred if the phase had been
changed immediately after the button activation, the phase is inverted on the next
zero crossing.
The DLY INV button
inverts the phase of the wet (processed) signal. Just like FB
INV it becomes audible when the delay time is short. The phase is actually inverted
on the next zero crossing to avoid clicks.
The BYPASS led
is lit when plug-in is in bypass mode, which can be activated by
switching off the POWER button. While in bypass mode, the processing does not
stop and is still continued in the background. The only difference is that the wet
signal is no longer sent to Lexicon PSP 42 output. This ensures that the plug-in
immediately returns to the state it would have been in, if bypass had not been
activated at all.
The OUTPUT MIX knob
controls the proportion in which dry and wet signals are
present in the Lexicon PSP 42 output. In the middle position both signals are
attenuated by -6dB.
The RPT oo button
turns the Lexicon PSP 42 into phrase sampler mode. The time
of the captured audio loop is equal to the current delay time that is set. If the
Lexicon PSP 42 is in DLY mode (controlled by DLY<>CLK button described
below), then the phrase sampler mode is activated immediately after the button has
been pressed. Alternatively, when in CLK mode, this mode will be actually
activated as soon as the CLK led blinks. This allows the perfect loop to be captured
if the delay time is tempo-locked. Right after activation, the input signal is recorded
into the internal buffer and then played back over and over again until RPT is
switched off. The internal sampling rate can still be changed while in RPT mode by
either the DLYx2 button or the modulation section, which results in playback speed
and pitch alteration. When the loop is captured, the 10 ms cross-fade is applied to
its ends to avoid clicks. As the contents of the captured buffer is lost when preset is
changed, RPT button position is not stored in a preset either.
