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News - December 2011

J-Scope  - Free VST Oscilloscope plugin                             23rd December 2011

Whilst experimenting with writing a VST synthesizer plugin, I found I needed an oscilloscope whose behaviour I understood. The synth plugin has not yet made it to a state where I feel it's worth releasing, but I think the oscilloscope may be useful to someone.

I've tried to make it fairly similar to a real oscilloscope, although the fact that the waveform is fed to it in bursts which don't necessarily synchronise with the computer's display refresh rate or with the oscilloscope's sweep rate makes it hard to accurately model a real screen. J-Scope accepts a stereo signal, and can display it in several modes:

  • Two separate traces, L and R
  • Single trace, sum of L and R
  • Single trace, difference between L and R
  • X/Y (Lissajous) plot, L vs R
  • X/Y (Lissajous) plot, Sum(L+R) vs Diff(L-R)

Other features of J-Scope include:

  • Timebase from 1s/div (0.1Hz) to 0.1ms/div (1kHz)
  • Gain (Y) from x0.1 to x100
  • DC or AC coupled
  • Variable X-offset of trace(s)
  • Y-offsets of stereo traces individually adjustable
  • Adjustable trigger level, on positive or negative slopes
  • Delayed triggering
  • Display 'freeze' option
  • Adjustable phosphor persistence
  • Optional graticule with variable brightness
  • 8 preset modes for quick setup


Visit: jaggedplanet.com




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