punkfolkrocker wrote: Tape inputs...???

Tape inputs are the same as any other line inputs, but they're paired with line outputs so you can record from the amp.

Some amps have, or used to have, a 'tape monitor' button so you can record, say, the tuner source but feed the recorded signal through the power amp. The deck needed a separate read head to do that.

Onkyo bought Pioneer - hence their sudden appearance as a hi-fi brand I suppose.