Filter – Cutoff

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 1. Description  2. Preset Sounds  3. System Requirements  4. Installation Notes  5. Technical Support and Contact  6. Update and Upgrade Policy  7. License  8. Release Notes  9. Plug-in Credits  10. Acknowledgements

Alphatron Oscillion is a polyphonic subtrac tive synthesizer to produc e a vast array of sounds, utilizing three main signal modules: frequenc y (voltage-c ontrolled osc illator VCO), timbre (voltage-c ontrolled filter VCF) and amplitude (voltage-c ontrolled amplifier VCA).

Four VCOs initiate the sound waveform and c ontrol its frequenc y. It also determines the initial timbre by the waveform option selec ted (sawtooth or square). The VCF module shapes the timbre via a low-pass filter with c utoff and resonanc e parameters c ontrolled by an envelope generator. The amplitude of the sound is shaped by the VCA envelope.

It generates ic onic vintage synthesizer sounds with distinc tive pads, pec uliar keys, punc hy basses, sparkle leads, c reepy effec ts, charming ambient soundsc apes or unearthly and otherworldly atmospheres. Suitable for many genres and styles of music and pliability to c ustom design over a diverse sonic palette. Available as a plugin in VST and VST3 64 bit versions for Windows, as well as in Audio Unit for mac OS.

 Voltage Controlled Osc illators (VCOs). They will generate the initial sound signal with four voltage c ontrolled osc illators (VCO1, VCO2, VCO3, VCO4), with the following parameters: o Fine. A fine-tuning knob that tunes the VCOs by a semitone. Gives a wide array of frequenc ies between the osc illators. o Oc tave. The knob to spec ify oc taves above or below the c urrent oc tave of the VCO by dialing in a range between -2 to +3 oc taves. o Shape. Morphs between sawtooth and square non-sinusoidal waveforms. The sawtooth waveform c ontains all harmonic s of the fundamental pitc h of the waveform. The square waveform c ontains just the odd harmonic s. o Speed. Defines the frequenc y or speed of the osc illator. Turn the knob c loc kwise to inc rease the rate or c ounterc loc kwise to dec rease the rate.

o Gain. This parameter is used to adjust the modulation gain level of eac h VCO.  Voltage Controlled Osc illator (VCO) Envelope. Changes the produc ed frequenc y. It c an be used to modify the attac k phase or to c reate spec ial effec t sounds.  Voltage Controlled Amplifier (VCA) Envelope. Controls the volume or amplitude of the sound with independent c ontrol over eac h ADSR stage (Attac k, Dec ay, Sustain,

Release) over the VCA amplifier that varies its gain depending on a c ontrol voltage.  The ‘Level’ slider determines the magnitude of the ac tion of the envelope.  Voltage Controlled Filter (VCF). A low-pass filter that lets the lower frequenc ies or harmonic s pass unc hanged, while it attenuates or reduc es the strength of the higher

frequenc ies, offering a simple and effec tive tone c ontrol to shape and c olor the sound sourc e.

o Cutoff. Controls the low-pass filter c utoff frequenc y. Determines where the signal is c ut off. o Resonanc e. Controls the low-pass filter resonanc e. Emphasize or suppress portions of the signal above or below the defined c utoff frequenc y.  Voltage Controlled Filter (VCF) Envelope. This sec tion provides c ontrol of the filter c utoff frequenc y over time, with independent c ontrol over eac h ADSR stage (Attac k, Dec ay,

Sustain, Release).

The ‘Level’ slider determines the magnitude of the ac tion of the ADSR envelope on the frequenc y and response of the low-pass filter.

 Chorus. A 4-voic e stereo c horus effec t that imparts ric hness and c harac ter to the sound by adding multiple short delays with a slight amount of feedbac k, making eac h sound distinc t from the original. o Toggle switc h On/Off. A switc h indic ator to turn ON/OFF the module. Press the toggle to ac tivate the effec t, the switc h will light, and c horus will be applied to the sound. To inac tivate the effec t, press again and it will turn off. o Stereo Spread. Adjusts the stereo spreading of the c horus voic es. For maximum stereo spread, fully c loc kwise rotation; for a monophonic c horus, simply set to

zero.

o Amplitude. Adjusts the presenc e of the c horus. Turn it c loc kwise to inc rease it or c ounterc loc kwise to dec rease it.

o Depth. The slider sets the balanc e between the unproc essed (dry) signal and the proc essed (wet) signal that will be blended.  Delay. A stereo delay that stores the input signal and plays it bac k after a c ertain amount of time, c reating from a subtle ec ho to a pronounc ed blending of previous sounds with new sounds. Parameters inc lude:

o Time. Modulation to vary the delay time dynamic ally. o Feedbac k. Regeneration of delay.  Reverb. Integrated reverberation module. o Toggle switc h On/Off. A switc h to turn on/off the unit. Press the toggle to ac tivate the effec t, the switc h will light, and reverb will be applied to the sound. To inac tivate the effec t, press again and it will turn off. o Size. The knob provides a spac iousness and depth to simulate the sound reflec tions from walls, floors and c eilings following a sound c reated in an ac oustic ally reflec tive environment. Small rooms c an be modeled as well as large spac es. o Width. This knob adjusts the stereo separation of the wet reverb signal.

 Pitc h Bend. A virtual wheel to vary the frequenc y or pitc h of the osc illators (VCOs) in a c ontinuously variable manner. Bend wheel upward raises the pitc h and moving it downward lowers the pitc h. It will automatic ally return to its initial position when released.

 Keyboard. The virtual keyboard lets you listen to the synthesizer sounds without the need for an external master MIDI keyboard. Just c lic k on a virtual key to hear the c orresponding sound.  Hint property. Tooltip when the mouse is over a c ontrol. You c an mouse over any of the c ontrols anywhere in Alphatron Osc illion and this will display a short desc ription of what that c ontrol does.

 Preset Manager. 'Browser' to load and save presets and banks, enabling to export to *.fxp (VST2 Preset), *.fxb (VST2 Bank), *.vstpreset (VST3 Preset), *.aupreset (Audio

Unit Preset) plus two generic formats (plain text): the *.xmlpreset (XML Preset) and the *.xmlbank (XML Bank), providing c ross-platform presets/banks. This allows to c ontrol over the loading and saving of presets from disk as well as sharing presets between different plugin formats using the generic *.xmlpreset (XML Preset) and the *.xmlbank (XML Bank).  50 internal presets (Pre-programmed sounds) c ategorized by type: ATMO (6), BASS (6), KEY (10), LEAD (12), PAD (8), PERC (2) and SFX (6) with an ultra-flexible sound shaping c apability to c reate diverse elec tronic sounds.  MIDI automation. Imple mentation of MIDI Continuous Controller parameters for use with external hardware c ontrol via DAW:

CC Number

1

5

12

13

14

15

16 MIDI Continuous Controller Name

Filter – Cutoff

Pitch Bend Wheel

Delay – Time

Delay – Feedback

Chorus – Switch

Chorus – Depth

Chorus – Stereo Spread