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 Helga by Kiesel Software is a Virtual Instrument and a Virtual Effect Audio Plugin for macOS and Windows. It functions as a VST Plugin.
Product Helga
Developer Kiesel Software
Price (MSRP)
Type / Tags Synth (Analogue / Subtractive)
Plug-in, App & Soundware Format(s)
Operating System Availability
Download Released
Downloads Released
N/A - Not Released
Miscellaneous Information
Copy ProtectionSerial Number

Two Low Frequency Oscillators (LFO)

  • Generates sine, up and down ramps, a square wave and a random waveform.
  • Frequency is midi syncable as well as syncable to an external pulse.

Two alias-free Oscillators (VCO)

  • Generates any mix of a ramp and a variable duty cycle pulse wave.
  • The pulse wave duty cycle can be modulated with an LFO or an ENV generator.
  • The output of both VCO's can be integrated to generate different waveforms.
  • Sync and ring modulation.

Envelope generators (ENV)

  • ADSR type (Attach, Decay, Sustain, Release).
  • Velocity and aftertouch sensitive.


  • Four-pole resonant low-pass/high-pass filter.
  • Has its own ENV generator for cutoff modulation.
  • Cutoff frequency can be further modulated with the LFOs and can track the keyboard pitch.

Source Mixer

  • White-noise source.
  • External input.

Keyboard processor

  • 32 voice polyphony max.
  • Polyphonic and unison mode with portamento.
  • Pitchbend and modulation wheels.

Delay Effect

  • LFO modulated.
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