Press play in the panel at the bottom of the screen. The sound sources and the filter buttons appear once audio is running, which can take a few seconds.
The space bar switches the filters in and out while the sound keeps playing. That A/B is the whole test: the difference is easier to hear as a change than as two things you compare from memory.
Legend:
Sample rate: <waiting audio context>
Audio: <waiting audio context>
Filters:
<waiting audio context>
Low pass filter:
High pass filter:
Info
Filters are IIR filters whose biquads were exported from VituixCAD with 48kHz sample rate and "Generic" DSP system.The filters used are listed below: