The CT-055W features an auto tape selector mechanism.
Allowable copy frequency response zone
D O L B Y N R : O F F
Test Tape: STD-608A
T a p e s e l e c t o r : N O R M
Test Tape: STD-603
Tape selector: CrO2
Test Tape: STD-6O4
T a p e s e l e c t o r : M E T A L