Hmmm dunno
But what with a xenys 502, PJB bass cub, Hartke HD25 and an iRigHD, or USB Audio interface I reckon I have silent practice covered!
Aside from a combo/head with aux in the xenys is such a good option as MP3, bass, guitar, mic can all go in
May revisit the USB audio interface for silent practice actually, it will give a great sound with its preamps