No doubt two of the best Huqin players I always revere and it's very difficult to have them playing a Gaohu 齊奏 together since they both are wonderful soloists in their own musical domain. IMHO, it would be an even better performance if they can agree upon their bowing and ornamentation in advance . It will definitely make the 齊奏 sound more unison and at the same time preserving the Cantonese style of playing.