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Studio Electronics Boomstar Manual 15 Panels

The

ENV DEPTH

(Envelope)knobsetsthedepthofthemodulationamount

asitisappliedtotheltercutofrequency.Theshapeofthelter

envelope is determined by the contouring controls attack, decay, sustain,

and release; the amount or depth of the envelope contouring is

determined by this parameter. Note: If the

MASTER

DRONE

switch is set to

theMasterposition,thenthelterfrequencyismodulatedby

ENV 2

, not

ENV 1

The

MOD DEPTH

knobsetsthemodulationamountofthelterbyeither

VCO 2

(VoltageControlledOscillator2),or

LFO

(LowFrequencyOscillator),viatheswitchtoitsleft.Oscillator2becomesanLFOwhenitsrangeswitchissettoits

position;inthehigherrangesettings(8,4,2)audiofrequencymodulation(thinkvocalandmetallictimbres/x-mod)

are achieved. The software-based LFO with its versatile, multiple waveforms can be synced to MIDI. [See pp. 17-18,

5.2.10]

5.2.7 ENV 1 - Envelope 1

word about the Filter Envelope:

Thelterenvelopeshapesthetimbreandovertonecontentoftheaudiosignalasitowsfromthecircuitryofthe

mixer.Thisenvelopeorcontourgeneratorisusedtodynamicallymovethecutofrequency.Itworksassuch:each

timeakeyisdepressedanenvelopeorcontourgeneratorattachedtothelter’scutofrequencyisactuated,and

sendsacontrolsignaltothelter.Thecontrolsignalrisesatonerate,fallsatasecondrate,levelsoatacertain

point,andthennallyfallsoatathirdrate.Thesefourparametersandtheireectuponthecutofrequencyare

explained below.

The

ATTACK

knob sets the attack time. The attack time determines the initial segment of the envelope. The frequency

atwhichthecontourbeginsisdeterminedbythelterfrequencysetting,whilethepeak,whichitreaches,is

determinedbythelterfrequencyandEnvelope1amountsettingscombined.Incrementingthe

ATTACK

knob value

from“0-10”willresultinthebrightnessofthesoundincreasingsharplyatrst,andthenmoregraduallyasthe

attack time lengthens. Switching

INVERT

on reverses the behaviour of the normal ADSR envelope. During the attack

phase(beginningwhenthekeyispressed),thesoundfadesfromthemaximumamplitudetozero;duringthedecay

phase, it rises to the value determined by the sustain setting; after the key has been released, the sound parameter

rises from sustain amplitude back to maximum amplitude: tricky and nice. Switching

LOOP

on causes the attack and

decayvaluestorepeatorloop,transformingEnvelope1intoaquasiLFO.Thesustainparameterisineectaswell.

The

DECAY

knob sets the decay time. The decay time determines the duration of the second segment of the envelope,

i.e.,thefallfromtheattackpeaktothesustainlevel.Whenrepeatedlydepressingakeyandincrementingthevalue

from“0–10,”youwillatrsthearthebrightnessdropsharplyaftertheinitialattack.Thisdropwillbecomemore

gradual as the decay time lengthens.

The

SUSTAIN

knobsetsthesustainlevel.Thesustainleveldeterminesthelterfrequencyatwhichtheenvelope

“levelso”aftertheinitialriseandfall.Thefrequencyofthesustainlevelcanbeashighastheinitialpeak,inwhich

case there is no decay after the initial rise, or it can be as low as the frequency at which the envelope contour began.

The

RELEASE

knobsetsthereleasetimeandisthefourthandnalstageoftheenvelopecontour.Finally,afterthe

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