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Siegfried Kullmann updates SQ-8L to v0.91b

Siegfried Kullmann

Siegfried Kullmann has updated SQ-8L to v0.91b which includes new and improved LFO and EG models, immediate parameter changes and minor bug fixes.


  • Parameter changes now immediately affect playing voices (except envelope parameters).
  • Fixed bug in DCA4 modulation causing voices to be never terminated.
  • Fixed problem with high CPU load after playing one-shot waveforms.
  • Voice restart should work correctly now.
  • LOOP voice stealing mode removed. The former HQ mode is now called SOFT.
  • New LFO implementation with much more accurate frequency and delay and the following new features (see paragraph D.2.):
    • Humanization (randomize LFO frequency).
      • ON = emulate SQ80/ESQ1 (no humanization for frequencies<7 or while fading)
      • 1x = humanize always
      • 2x, 4x, 8x, 16x = humanize more
    • All waveforms of OSC1-3 can be used for LFOs (except the drum kits)
    • Frequency modulation (FREQMOD).
    • Adjustable phase offset (PHS) (in addition to trigger phase).
    • Twin mode (PHS parameter, indicated by "T" in the value): Two phase-shifted waves are subtracted from each other.
    • 4 Playback modes (PLAY):
      • FWD = forward
      • REV = reversed (=backwards)
      • 1XF = one-shot forward
      • 1XR = one-shot reversed
    • Smoothing (SMTH, applied before amplitude modulation).
    • Different modes for amplitude/frequency modulators (AM, FM):
      • UNI = unipolar (source is clipped below zero, used to correctly emulate the AM of SQ80/ESQ1 LFOs)
      • BIP = bipolar (was incorrectly used for AM until this version)
      • PHS = modulate LFO phase offset instead
      • SMT = modulate LFO smoothing instead
    • Modes for LFO delay:
      • EMU = emulate SQ80/ESQ1
      • SMTH = smoother fading
    • Frequency range extended from 0..63 to 0..127
  • New envelope features (see paragraph D.3.):
    • Start level (L0) instead of fixed to zero.
    • CYC parameter for each envelope (=play full cycle without sustain).
    • Smoothing filter (SMTH).
    • Parameter MODE-T1V switches between:
      • T1 = Velocity modulates attack time (T1) by amount in T1V
      • SMT = Velocity modulates smoothness (SMTH) by amount in T1V
    • Different output shapers (SHAPE):
      • OFF = no shaping
      • EXP..EXP4 = exponential shaping
      • TAN..TAN3 = hyperbolic tangent shaping
  • New emulation features (see also paragraph D.1.):
    • Smoothing of DCA1-3 volumes:
      • EMU = emulate SQ80/ESQ1
      • FAST = less accurate but without latency
    • Smoothing of DCA4 volume:
      • EMU = emulate SQ80/ESQ1 (soft attack)
      • HARD = hard attack
    • MUFFLE:
      • OFF = crisp sound
      • ON = attenuate high frequencies to sound more like the SQ80/ESQ1
    • DC offset blocking filter (DC-BLOCK):
      • SMART = use filter when needed (when SYNC=ON)
      • ON = always on
      • OFF = always off
  • Changes in sound banks:
    • Banks A, B = user banks
    • Bank C = SQ8L factory bank
    • Bank D = original SQ80 factory bank
  • GUI changes:
    • Bigger GUI with buttons to select parameter pages (see paragraph E.3.).
    • Most display pages can now be scrolled/toggled to show additional parameters (see paragraph E.2.)
    • Fixed bug with window scaling causing wrong placement of GUI controls (has not been tested).
    • Fixed problems with "jumping mouse" (I hope so).
    • The knobs and buttons should no longer steal the keyboard focus (has not been tested).
    • Several emulation parameters can be overridden by settings in the options menu.
    • Added modulation source usage window (temporary, see paragraph E.4.).


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