Lexicon PCM 42 - Page 5

D. FEEDBACK
cloc k\ wise feeds the
Be WECUY FILTER
Engaging the HI CUT
ne OONG low-pass f Nee i
back path. This is useft
aiat ing room am bien CE
ness of highl ly reson
Engag
reverses
fed bac
back signal ats phase c Bich acter
and is typically used for resonant fenuingss sounds:
G. DLY INV
Engaging the DLY INV (Delay Invert) button reverses
the polarity of the delayed sound which ts fed to the
OQUTPUT MIX control (Fig. 2.7, 1).
H. BYPASS LED
In Bypass mode, the Delay signal is cut out of the mix
at the MAIN OUTPUT, and all input to the delay line is
cut off. This LED is illuminated when the BYPASS is ac-
tivated by the optional footswitch or an external logic
signal.
|. OUTPUT MIX
The OUTPUT MIX control establishes the ratio of
direct to delayed sound in the PCM 42 MAIN OUTPUT.
Full counterclockwise position (toward INPUT) provides
100% direct sound from the input preamplifier. Full
clockwise position provides 100% delayed sound. The
control is detented in center position, where the blend
of signals is equal. This point is calibrated for maximum
notch depth during flanging.
J. © RPT
The INFINITE RPT pushbutton causes the PCM 42 to
capture the sound in the delay memory at the first clock
pulse after the button is pressed and repeat that seg-
ment continuously until the button is pressed again
The repeat mode uses the entire delay memory — the
length of the captured segment is independent of the
delay tap selected with the UP and DOWN pushbut-
tons, but changes with the settings of the MANUAL
VCO-SWEEP control and the DELAY X2 pushbutton.
ise ae the infinite repeat mode is enabled not at
nt the button is pressed, but at the first clock
cree (as Ow He the flashing CLK LED at the right of
he di / that time. To See rapid entry into this
rate To a sma
delay time lene section K, below!
il fraction of the total
TI ill not power up in repeat mode. If the
INFINITE RPT button is “IN” at time of power up, the
‘ll not enter the : Ae eat mode until the pushbutton
is released ane press
selected throu
to the rear pane
ee Repeat mode can also be
ry-contact switch attached
REP EAT jack (Fig. 2.2, D}.
K. SET-MODE
The SET-MODE slide sv vitch determines the function
of the display and the U P ag d DOWN pushbuttons. In
normal operation, this switc “ s set to DLY (left) and the
display shows the delay time in milliseconds, while the
pushbuttons increment and decrement the delay tap
selection.
With the SET-MODE switch in the CLK (right) posi-
tion, the UP and DOWN pushbuttons change the rate
of the flashing CLK LED and of the pulses appearing at
the CLOCK output. In this mode, the display indicates
the period of the clock as a fraction of the maximum
delay time (as determined by the DELAY X2 and the
MANUAL VCO-SWEEP settings). The numerator of the
fraction is on the left, the denominator on the right. The
DOWN button cycles the numerator through odd in-
tegers 1, 3, 5, 7, and 9. The UP pushbutton causes the
denominator of the fraction to cycle through binary
values 1, 2, 4, 16, 32, and 64.
L. DOWN BUTTON — DELAY/CLOCK
The DOWN pushbutton decrements the delay tap
value or the denominator of the CLOCK output ratio, as
described in paragraph ‘‘K’’ above. With the SET-
MODE switch in DLY, a short press and release of the
button will decrease the delay time by one increment. If
the button is held in, the selection will decrease approx-
imately once per second. To move rapidly to a new set-
ting, the UP button may be pressed while continuing to
hold DOWN. When UP is released, the increment rate
reverts to once per second.
M. UP BUTTON — DELAY/CLOCK
The UP pushbutton increments the delay tap value or
the numerator of the clock ratio as described above in
paragraphs “’K"’ and “L’’. As with DOWN, the rate of
increase of the delay time may be accelerated by press-
ing DOWN while holding UP. Thus, the direction of
change is determined by which button is pressed first,
while the rapid mode is enabled by the opposite button.