'T{PUT
' INPUT LEVEL: Tha input loEl control adiusts tha signal let€l ard conse'
quently ihs thru put gain ol th€ systom.
Al tho MIN $nirlg ltp.y slorn grln B (x 0) to sllow high lml lign ls (up to 7.1
Vrmr) to b6 pro6ad.
Al lhe MAX stting tho systsm gain is +20d8 (X 10) to allow low lewl signsls
(down to 0.1 Vrms) lo bo prm8sad. Ths output ot the unit will bo amplilisd by a
lactor o, l0 with resp€ct lo ths inpul.
Wh6n ths control is at tho 12:00 o'clock (straighl up) position, the system gsin
is approximately uniry (X l); i.e., tho oul pul signal will b€ the smo amplitude as
the input signal.
' LIMIT: The Bed LIMIT LED indicates that the signal level being pr@essed is
at the odb Gleence poinl. odb indicaies the onset ot clipping ard/or slew limit-
ing. Thore is an additionsl 6tB ot headroom b€yond what is indicated to allow for
unanticipatad overloading in aclual usge.
' ACTIVE: The gEn ACTIVE LEO indicales thal the signal being prGessd
is greater lhan -20d8 below retersnce. The INPUT LEVEL should be set such
that the grmn ACTIVE LED is tull on for most of the lime. lf the input is too low
lhe green ACTIVE LED will be otf tor most ot the time.
DELAY
The delay lunclion consists of a bank of pushbutton switches. including a lull
memory inlinite repeat and a delay lactor adjusl control.
' DELAY FACTOR: The delay factor varies the basic ctock frequency ihat
determines the delay thereby acting as a manual delay adjust. The extreme set-
tings are 0.25 and 1.0. Each line represnts a change ol approximately 0.05. The
*lected delay (via pushbulton) can be multiplied by ihe delay lactor stting to
calculate the actual delay.
' FLANGE: Three white pushbuttons are usd to select short time delays used
tor flanging ertects. The range ol each button can be varied by the DELAY FAC-
TOR or the MOOULATOFI controls. The ranges are as lollows:
Hl 0.25 ms to 1 ms
MID 1 msto 4ms
LO 4 mstol6ms
' DOUBLE: The gray pushbution selecls the delay range suitable lor doubling
etfects. The delay range varies lrom 16 ms to 64 ms.
' ECHO: The black pushbutton on the ADM 256 selects delays which create
echos - audible repeats. The range ol delay is 64 ms lo 256 ms. The ADM 1024
provides two black bullons which expand the Gpability ol the system. The range
o, the ADM 1024 SHORT ECHO is 64 ms to 256 ms. The range of the LONG
ECHO is 256 ms to 1024 ms.
' CAUTION: When all the delay buttons are in the OUT position, the memory
is bypased and there is virtually no delay in the ouiput signal It the OELAY MtX
is sl at -50% delay/source. the output signal will virtually be emelled. By
depre$in9 a delay button, ihe signal will b€ restored.
FEEDBACK
' Ihe FEEOBACK conirol varies the amplitude of the signal that is ted back ard
regeneraled. Close to 'l0O% f*dback, just shorl of o$illation, is possiblo at eilhet
o, the extreme settings. The regeneratod signal pass lhrough a 10 kllz low pass
lilter to mimimize noise buildup as it is being fed back.
(-) At this stting. the signal is ted back oui o, phas (negative f*dback). The
maximum stting is full counter cl@kwi*; various amounts of negalive ,eedback
are possible starting rrom zero through ihe maximum posilion.
(+) Al this setting, the signal is fed back in phas (positive fedback). The max-
imum setting is tull clockwise; various amounls of posilive feedback are possible
starting from zero through the maximum position.
0 At the aro (click) center position, there is no fedback - hence, no
regeneration.
MODULATOR
The ADM 256/1024 has a precision inlernal VCO (voltage controlled oscillelor)
which is cmtrolled by an LFO (low lrequency o$illator). The LFO cmlrols make
up the MODULATOR *clion ol the ,ront panel. Thes controls intemct with the
DELAY FACTOH f ront parel control and with tho (0 to +5V) CONTROL input
locat€d on the rear panel.
' WIDTH: The width control wries the srvesp of th€ intemal osillator. ln the
10O9o posilion, the delay limes vary from less ihan (.25 X) to groater than (X l) of
the pushbution delay stting, allowing two Glaves ot swoep. Should any satting
less than 1009! be used, the DELAY FACTOR control should be adiusted to set
the desired center ol the swep. The WIDTH control should be st to the 0 pGi-
tion il the LFO is not being usd and acurate delay tires are required.
The wIDTH conlrol also interacls wilh any sxternally applied control signal
and should therefore be st at 0 for maximum control lrom an external source
such as a foot pedal, synlhesizer, envelope followor or other similar type control
signal in the (0 lo +5V) range.
' SPEEDT The speed control varies lhe rale of modulation o, the inlemal oscil-
lator from approximatelv 0.1 Hz to 10 Hz.
OUTPUT
The output level is not adjustable. The output signal level varies only with lhe
input signal level and input level conlrol.
' DELAY MIX: The processed signal can be mixed in or out of pha* with the
source via the delay mix control.
. . . At -1009o, lhe output coosists o, only the delayed signal (out-ol-phas€).
. . At -50o/o. the outpul consists o, equal amounts of source and out-of-phas
delayed signal.
. . .At SOUBCE, the output consists only of the source signal.
. . . At 150%, the output consisls ot equal amounls ol surce and in-pha*
delayed signal.
. . . At +1000/0, ihe oulput consists of only the delayed signal (in-phas).
Ol cour*, intermediale settings are also po$ible.
INFINITE REPEAT
' INFINITE REPEAT: The red pushbutton is used to recirculate the data stored
in the ,ull memory ol the unit. On lhe ADM 256 the ,ull memory varies from 64 ms
to 256 ms depending on the OELAY FACTOR adjust. Similarly. the ADM 1024 full
msmory varies from 256 ms to 1 024 ms. lt is possible to synchronize the start o,
the inlinite repeat via the other delay buttons.
fur.* #
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