I made several stethoscope mics. Just a Omni electret capsule glued into a st¨¦thoscope. About 10Hz- >20000 kHz. You hear the same as with a stethoscope thus with body noises. No need to adjust the sensitivity of the mic. The Hollywood heartbeat is an ankerchief, plied in 4 recorded rhythmically with a dynamic mic and light EQ. No body noise...
