if (channel == 0) {

                float result = 0; // initialisation to 0 of the result

                for (int sample = 0; sample < buffer.getNumSamples(); sample++) { // for each sample

                    // moving the samples in the delay line
                    for (int i = 0; i < 8; i++) { // delayLine being 9 values long
                        delayLine[i + 1] = delayLine[i];
                    }
                    delayLine[0] = reader[sample];

                    result = 0;
                    for (int i = 0; i < 9; i++) { // for each tap
                        result = result + delayLine[i] * filterTaps[i]; // multiply
                    }
                    writeback[sample] = result; // output

                }
            }

filterTaps[0] = 0.002385;
    filterTaps[1] = 0.011910;
    filterTaps[2] = 0.026352;
    filterTaps[3] = 0.039825;
    filterTaps[4] = 0.045351;
    filterTaps[5] = 0.039825;
    filterTaps[6] = 0.026352;
    filterTaps[7] = 0.011910;
    filterTaps[8] = 0.002385;