Asound mixer, impressed by the new equipment that was just installed in his recording studio, says that now he will be able to singers and musicians produce better music because he can eliminate unneeded and undesired wavelengths. what term describes the characteristic of sound waves that the sound mixer is now able to alter?

Frequency

Explanation:

A frequency mixer is an electrical circuit that creates new frequencies from two different signals. The practically new frequency is produced by adding and subtracting input signals.  

The frequency range is shifted from one range to another by a process known as heterodyning. Sound mixers will alter the frequency of waves to suit according to musicians.

european feudalism was a combination of legal and military customs in medieval europe that flourished between the 9th and 15th centuries. broadly defined, it was a way of structuring society around relationships derived from the holding of land in exchange for service or labour.

japanese feudalism. the era of feudalism in japan took place from the 12th through 19th centuries. during that period local rulers, either powerful families or military warlords, dominated the land, while the emperor was merely a figurehead and not a significant political presence.