Tone Bar Layer

The tone bar’s only component is a resonant band-pass filter with constant skirt, better known as a resonator in modal synthesis. Sending a source of excitation to the resonator will output a decaying sine wave oscillating at the filter’s frequency. The sine wave’s decay time is determined by the filter’s resonance (Q).

In this instrument the abstraction b.resonator~ from the mkmr library is being used, but there are plenty of resonators to choose from for Pure Data:

• resonator~ from the else library: Download at GitHub or Deken
• filtercoeff.mmb or filtercoeff.mmb~ set at “resonant” from the mmb library: Download at GitHub
• hv.filter set at “bandpass 1” from the heavy library: Download at GitHub

The inlets parameters for b.resonator~ are the following:

1. signal - signal to be filtered or excite the resonator.
2. float - sets the central cutoff frequency in hertz.
3. float - sets the filter’s resonance (Q).
4. bang - reinitialize the filter’s internal state.