DSP Plugin Test & Verification — Honest THD/CPU Benchmarking
Verify and benchmark DSP audio plugins by identifying harness bugs, measuring real THD, and auditing CPU load.
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See it in action
You say
My JUCE test for click-free switching is failing even though the audio sounds clean. The assertion checks if the sample delta is less than 0.05. How do I fix the test?
Your agent does
The 0.05 threshold is physically impossible for a 1kHz sine; the slope itself exceeds that. Switch to a differential test. Run the signal twice: once steady-state and once with a swap. The test passes if the excess discontinuity at the swap boundary is zero relative to the steady-state run.
What you get
About this skill
The problem
DSP unit test failures are often caused by flawed test harnesses rather than the audio processing code itself. Developers waste hours debugging implementation logic when the actual issue is an impossible threshold or a measurement helper that clobbers the internal state.
What it does
- Identifies harness bugs like measurement helpers that overwrite plugin configurations before testing.
- Implements differential testing for click-free profile swaps to distinguish harmonic content from genuine pops.
- Provides recipes for measuring THD and aliasing using Goertzel filters and fold-back frequency analysis.
- Verifies real-time safety by benchmarking actual CPU load against hardware block budgets.
- Corrects parameter driving logic to use raw choice indices instead of normalized values.
Frameworks & tools
Optimized for JUCE and C++20 audio plugins, with portable methodologies for any real-time DSP environment.
Why this beats prompting it yourself
General AI often suggests relaxing thresholds to make tests pass. This skill enforces physical reality, ensuring you report honest metrics like -90 dBFS aliasing only when physically achievable, preventing "fake green" builds.
Use cases
- Debug failing assertions in
processBlocksequences. - Verify oversampling suppression at 2x, 4x, and 8x rates.
- Benchmark CPU consumption across different plugin states.
- Audit parameter listeners for index mapping errors.
Known limitations
Not intended for GUI layout testing or general non-audio debugging. Requires an existing C++ test harness to apply fixes.
How to install
Drop the file into your AI Agent. Works with Claude, Cursor, ChatGPT, and 20+ more.
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