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WahWah preview significantly differs from end result when resonance > 1.0 #9191

@EvanBalster

Description

@EvanBalster

Bug description

The WahWah effect sounds very different in the preview than the rendered output when resonance is set to a high value.

Steps to reproduce

Synthesize a few seconds of pink noise and set up a WahWah effect with the following settings:

  • LFO Frequency 2.0
  • LFO Start Phase 0.0 / any
  • Depth 100%
  • Resonance 4.0 ~ 8.0
  • Wah frequency offset 30%
  • Output gain 0.0

Click the preview button to play the sound, then click apply and note the result.

Expected behavior

I would expect the rendered output to be similar to the preview. Alternatively, I would expect the option to perform a high-quality preview or render a low-quality output so that the preview matches the result. Ideally both.

Currently I find the aliased resonance produced in the preview much more interesting than what I can achieve in a rendered output.

Actual behavior

The resonance is much less apparent in the output than the preview, possibly as a result of reduced harmonic distortion. The rendered output seems to have significantly less high-frequency activity.

Audacity Version

Audacity 3.7.5

Operating system

Windows

Additional context

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    AU3-bugBugs from Audacity 3P2Medium priorityregressionBug is a regression against previous version

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