What should improve next is user experience symphonious effect, it includes factor of 4 crucial point: Delay when, attenuation, frequency is answered and echo is controlled.
下一步要改良的就是用户体验和音效，它包括四个要害身分：时延、衰减、频率响应和反映节制。
adj. 和谐的；调和的
harmonious、
balanced