You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/Fyrox/fyrox-sound/src/effects
    
    the code of the file until where you have to start completion: //! Contins everything related to audio effects that can be applied to an audio bus.

use crate::{
    effects::filter::{
        AllPassFilterEffec
    
    fn render(&mut self, input: &[(f32, f32)], output: &mut [(f32, f32)]) {
        for ((input_left, input_right), (output_left, output_right)) in
            input.iter().zip(output.iter_mut())
        {
            *output_left = *input_left * self.gain;
            *output_right = *input_right * self.gain;
        }
    }