Legacy Locos can operate at 32, 100, or 200 speed steps. Non-Legacy only 32 speed steps. Cab1 and Cab1-L operate in relative mode, speed step selection is in the loco with running Legacy locos, not the Cab.
With the Cab1 or Cab1-L, use the L(32), M(100), or H(100 w/ some momentum) on Legacy locos to set desired operation. Non-Legacy, this sets the momentum; with the exception of aftermarket locos which cannot support Momentum if they have Cruise.
The TPC will operate just fine on all speed step selections with the Cab1 or Cab1-L, as he TPC was designed back in the TMCC only days. With a Cab-2, use the Cab1 setting.