public void setDryFilter(Filter dryFilter) {
        this.dryFilter = dryFilter;
        if (channel >= 0)
            getRenderer().updateSourceParam(this, AudioParam.DryFilter);
    }
Set the dry filter to use for this audio node.

When {@link AudioNode#setReverbEnabled(boolean) reverb} is used,
the dry filter will only influence the "dry" portion of the audio,
e.g. not the reverberated parts of the AudioNode playing.

See the relevant documentation for the {@link Filter} to determine the
effect.

@param dryFilter The filter to set, or null to disable dry filter.
jme3-core/src/main/java/com/jme3/audio/AudioNode.java