The RigPi V2 software (and maybe V1, but I'm not hooked up that way), when you hit the TUNE button, the system goes bonkers. The TS-2000 makes some noise, the MFJ-993 tuner kicks in for a second and then the MFJ-1234 box emits a high-pitched whine which will not stop. The only solution is to shutdown RigPI and the TS-2000 and do a power cycle.
73, WD0UG