- Using this setting, you can fill in any sampling rate you choose under the Custom “Sample Rate (Hz)” field via your keyboard. This could be useful in some situations, provided your sound card can support anything but the standard sample rates. The range of sample rates which can be entered as a Custom value is any integer extending from 100 Hz up to 210,000 Hz (210 kHz). Your sound card/sound card driver may limit this range of capability. This permits a Nyquist bandwidth of up to 105 kHz which is useful in some scientific applications (ultra-sound)