The basic way to calculate your maximum heart rate is to subtract your age from 220. For example, if you're 45 years old, subtract 45 from 220 to get a maximum heart rate of 175.
If you have an eighth-inch jack, all you've got to do is plug it into this port and start testing sound. 1  If you have a USB jack on the end of your microphone, most computers will have two or more USB ports on the side, or the back of the computer. 2  Simply plug the USB jack into one of these ports.
Keyboards often have a MIDI-out or a USB port so you can record directly, if not, use the headphone jack on it and plug it like you plugged the guitar/bass/microphone. 4. Record other instruments. Other instruments like violins or pianos need a microphone in order to be recorded.