Lexicon PSP 42 Operation Manual page 15

Lexicon PSP 42 Operation Manual
The MAIN DISPLAY area consists of two parts, – a four digit display showing
the current delay time in ms or the numerator and denominator values and three
leds, one of which blinks in sync with the host tempo and the
numerator/denominator values set, while the other two indicate the RPT mode and
HI CUT filter, respectively. The Delay time in ms is always the actual delay time
which depends not only on the delay buffer length as set with DN/UP buttons and
invisible sliders, but also on the sampling rate that the buffer is operating with. Any
change of the sampling rate caused either by pressing DLYx2 button or by
modulation section activity and the MANUAL knob, will affect the delay time that
is displayed. The whole area of the display has been arranged to act as an invisible
slider for more intuitive delay time control.
The MANUAL knob controls the internal delay buffer sampling rate, in relation to
the host sampling rate. The internal rate can be set to any value between 0,5x and
1,5x of the host sampling rate. Note that the internal sampling rate is affected by the
LFO and envelope detector, as well as to the extent that is controlled by the DEPTH
knob. To keep the resulting internal sampling rate within allowed boundaries of
0,5x....1,5x, the MANUAL knob operation range is narrowed if the DEPTH knob
is set to a value greater than 0. When DEPTH is in its maximum position, the
MANUAL knob does not affect the processing at all.
The DEPTH knob sets to what extent the internal sampling rate, which determines
delay time and playback pitch, is affected by the modulation signal consisting of the
LFO and envelope detector signals.
The WAVEFORM knob switches between the two LFO waveforms available
(sinus and square), and controls the proportion in which the LFO and envelope
detector signals are mixed to form the final modulation signal that is controlling the
internal sampling frequency.
The RATE knob sets the LFO frequency that is ranging from 0.1Hz, through 1Hz
in the middle position, to the maximum of 10Hz. The RATE led blinks at this
frequency and its brightness shows the current LFO phase.
The RATE led blinks at the frequency that is set by the RATE knob. Its
instantaneous brightness depends on the phase the LFO is in at the moment.
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