How to play Dong's big pipa?

When playing the Dong pipa, we usually sit in a sitting position, with the piano box on our right leg and the piano head tilted to the left. The left hand holds the piano rod and sounds by the strings, and the right hand holds the pick to pluck the strings. The pickaxe is made of old bamboo, ox horn or ox bone. The tune of Dong nationality's big pipa, with three strings and one tune; The two strings in the middle of the ukulele are homophonic; The middle and outer strings of banjo players are both double strings, which are homophonic. The tuning of the three-string pipa is: c, d, a; The tune of the four-string big pipa is: c, d, d, a; The tune of the five-stringed big pipa is: c, d, d, a, a, and the range is c~f 1. The timbre is rich and full, but it varies with the strings: the timbre of the silk string is soft, the timbre of the steel wire string is bright, and the tendon string is deep and heavy. Melody is often played with external strings, and other strings are accompanied by empty strings, or you can play it twice to get a harmonious effect. It is often used to accompany Dong narrative pipa, especially male voice, and is mostly played and sung by one person. It can also be used for solo or accompaniment of Dong Opera. When the accompaniment narrates Long song, it is only used for prelude and interlude. Usually without accompaniment, sometimes just improvise during the singing process to strengthen the rhythm of the song. When we accompany the big songs sung by the Dong chorus, we often use the big piano box and the big pipa with tendons, which has a deep and rich pronunciation and is in harmony with the rich timbre of the male chorus.