SFZ+ Professional

rgc:audio’s revolutionary SoundFont player sample-playback engine, packed in a professional VST/DXi instrument. Outstanding sound quality, stereo built-in effects, adjustable CPU/quality settings to adjust it to your hardware, fully multitimbral operation, multiple stereo outputs, several loading modes including direct-from-disk streaming and a beautiful interface make sfz+ the perfect choice for SoundFont users and professional composers.

SFZ+ Professional image

Main Engine

  • High Quality bandlimiting sample-playback engine
  • 9 quality settings to allow precise CPU usage optimization
  • 256 voices of polyphony, unlimited layers per voice
  • Per-channel polyphony limiter
  • Fully multitimbral operation, supports all 16 MIDI channels
  • Allows loading one file per MIDI channel, or single-file multitimbral operation
  • Supports any standard/custom samplerate, including 22, 32, 44.1, 48, 88.2, 96, 192 and 384 kHz
  • Extensive SoundFont compatibility
  • Reads SoundFont files (.sf2), 16/24/32-bit wave files (.wav), mono or stereo
  • Several SoundFont loading modes: Whole SoundFont, Single Preset
  • Four stereo outputs, one stereo Effects output

Sound Generator

  • A LPF, two LFOs and two Envelope Generators per layer
  • Filter Cutoff, Filter Resonance, Keyboard Tracking, Velocity Tracking and Envelope Amount
  • Vibrato LFO with Delay, Speed and Depth control
  • Modulation LFO with Delay, Depth, Filter Depth, Pitch Depth and Amp Depth controls
  • Modulation EG with Attack, Hold, Keyboard-To-Hold, Decay, Keyboard-To-Decay, Sustain, Release and Pitch Depth controls
  • Amplifier EG with Delay, Attack, Hold, Keyboard-To-Hold, Decay, Keyboard-To-Decay, Sustain and Release controls


  • Stereo Chorus with Mix, Speed and Depth controls
  • Stereo Reverb with Mix, Size, Damp and High Frequency controls
  • Effects on/off button

Programs / Banks

  • 128 internal programs (scenes).
  • Saves and Loads standard program (.fxp) files.
  • Drag and drop support for program files (.fxp), SoundFont files (.sf2) and Wave files (.wav).
  • All settings saved in the song.

Graphic User Interface

  • Total Layers and Voices played indicator.
  • Focus-capable controls, full PC-Keyboard support.
  • Full mouse wheel support.
  • Inertial sliders, menu-driven multi lists, fast page selectors.
  • Output level VU meter.
  • Sound Preview ribbon at bottom, MIDI transmit to host (VST).

MIDI implementation

  • Extensive MIDI implementation: Velocity, Pitch Bend, Modulation, Sustain Sw and a lot more.

ASIO microHost

  • Ultra light ASIO host for live performance and programming (90k)
  • Supports 44.1, 48, 88.2 and 96 kHz samplerates.
  • Virtual keyboard with Pitch Bend/Modulation/Program Change/Transpose controls using PC keyboard
  • Simultaneous use of multiple MIDI ports
  • Saves 16-bit and 32-bit WAV files

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