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14Studio Electronics Boomstar Quick Start Manual Panels

5.2.5 VCO 2 - Voltage Controlled Oscillator 2

The

TRACK

switch selects Oscillator 2’s pitch tracking response. The

position is the “business as usual,” 1 volt per

octave default setting. The

OFF

positiondisconnectsthepitchcontrolofthekeyboardsoaxedorstaticpitchcanbe

achieved,whichisusefulandexpressiveinavarietyofways,i.e.,asaxedvaluelowfrequencymodulatorwhenthe

settingisemployed,a“anged,”“phasey”syncedOscillatortimbreeect,oranon-tracking,staticdrone.Comeup

withsomeofyourown!

OSC 2’s

RANGE

switch functions identically to OSC 1’s

RANGE

switch for selecting the octave:

(lowfrequency

inaudibleclicks),

32’, 16’, 8’, 4’, 2’

The

WAVE

switchselectstheSawtooth,Triangle,orxedSquarewave.

Thecoarse/ne

TUNE

knob sets the pitch, or synced harmonic value when the

SYNC

switch of Oscillator 1 is in the

position—averypotenttweakinghotspot!Therangeofthetunepotisincreasedwhen

TRACK

iso.

The

MOD DEPTH

knob sets the depth at which

ENV 1

, or

ENV 2

modulates the frequency or pitch of 2.

5.2.6 VCF 2 - Voltage Controlled Filter

word about the Filter:

TheBoomstar’sunique,classiclterdesignsfeaturewiderange

lowpasslters,andinthecaseofthe5089, 4075, and 3003 self-

oscillatinglters.TheSEM features a notch that sweeps from

low-pass to high-pass, as well as a band-pass mode. The SE80 is a

multimodelter,withdualfrequencyandresonancecontrols,forthelow-passandhigh-passresponse.TheFilter

attenuates,orcutsothehigherfrequencycomponents—thosewhichlieabovetheadjustablecutofrequency—

and passes the lower frequency components of the audio signal. [see Filter Talk, p. 25]

The

FREQUENCY

knobsetsthiscutofrequency:thelowerthecutofrequency,thelessharmoniccontentthe

waveformwillretainafterpassingthroughthelter.Awaveshaperoundingandsmoothingoccursasthiscuto

frequency is reduced.

The

TRACK

switchselectstheltertracking(sometimescalledkeyboardfolloworkeyboardscaling)to

FULL, OFF

, or

HALF

.Filtertrackingapplieskeyboardcontrolvoltagetothelter:moretracking,morebrightnessasyouascendthe

keyboard. A

FULL

, tracking selection makes the low end and bassy and round, and the high end cut better with its

increased brightness, clarity, and edge.

The

RESONANCE

knobsetsthelterresonance.Theresonance,or“Q,”emphasizes,orboosts,thecutofrequency

region making the presence of harmonics more apparent. The 5089 and 4075lterswillbegintoself-oscillateas

the knob passes the 3 o’clock position. Resonance is a pure sine wave and can be used as a separate tone source.

Resonance is in fact negative feedback—a signature sound of subtractive synthesis.

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