How does the semi automatic transmission work.

[Philspanner]

Although not a true automatic. Can anyone tell me how the coupling is achieved. I was told it was by wet clutches. I am familiar with torque converters, fluid couplings, electromechanical and mechanical clutches.
My only guess is sintered bronze clutches, similar to the early British Leyland mini and controlled by high frequency solenoid that metered oil pressure, to achieved a slip engagement.
My interest in the subject is purely a need to understanding machines.
Thank you . Phil.