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Band Pass Filter bug...
  • In sfozando, when the band-pass filter is activated:


    The opcode:

    resonance= quite screwy. With resonance=0, all that sforzando geberates is two loud clicks.

    Then, the range for adjusting the actual resonance is backwards, with full resonance being:




    ...equaling zero resonance.

    Testing was done against the RGC/Cakewalk SFZ soft synth, in which the band-pass filter resonance range is 0 - 40db

  • davidvdavidv
    Posts: 453

    resonance=0 is a limit case and the Biquad maths pretty much everyone uses in this field (including, in most probability SFZ 1.0) adds parameter checking code to limit values internally.

    Sadly the spec doesn't mention this limiting and we are stuck 'emulating' another engine's exact math behaviour through reverse engineering.

    I've previously fixed lpf_XX and hpf_xx but not bpf it seems, adding it to my TODO list.

    Thanks for the report.

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