+<input type="radio" name="IR_FilterMethod" value="fourier_table">Fourier Table<br>
+<input type="radio" name="IR_FilterMethod" value="fft">FFT (Fast Fourier)<br>
+<input type="radio" name="IR_FilterMethod" value="fftw">FFTW (Fastest Fourier Library)<br>
+<input type="radio" name="IR_FilterMethod" value="rfftw">RFFTW (Real-mode Fastest Fourier Library)<br>
+<p>
+Zeropad: (frequency-base filtering only)<br>
+<input type="text" name="IR_Zeropad" size="1" value="2"><br>