Erhu is the main bowed-string instrument in traditional Chinese music, like violin in western music. It has two strings and its top plate is made of snake skin. Numerous solo works were written for erhu. In this paper, erhu resynthesis/transynthesis software is presented. We use frame based methods to analyze pitch and volume information of a solo erhu recording. Then, one can re-synthesize it using the erhu timbre extracted from the original recording, other erhu timbres, or even timbres like violin and trumpet. Additive synthesis and subtractive synthesis methods are used to synthesize the overall sound. Because the expression and playing style of the original recording are preserved, the result is realistic and musical.