Bass Cat’s Face
This is a specialized variant of the Cat’s Face shown on the previous page. It uses just one of the three modes of vibration available on that instrument. The Bass Cat’s Face has long whiskers of spring-steel rod. Their frequency is subsonic and inaudible for oscillation in the primary mode of vibration (that’s the “swinging back and forth mode” that works so well for shorter plucked prongs). With a special plucking technique that involves flexing and releasing, the rods on the Bass Cat’s Face can be excited in the second mode. This is a different pattern of vibratory movement, higher in frequency than the subsonic first mode but still fairly low, producing the distinctive tone you hear in the audio sample.