The solution for me is a boss line selector and a rocktron patchmate .Patchmate send 1 >boss A return ,boss send A>patchmate return1,patchmate send 8>boss B return,boss send B > patchmate return 8,boss output > in modfactor,out modfactor > boss input.The mode of line selector in A+B mix,use levels of the ls-2 to match the two signals, excuse me for tthe bad english.
