Sound output and input data. Please check my connections

Hi,

On the back of the tower there are five jack points for sound

Blue green Pink
orange grey

At present, I have small speakers plugged into the green jackpoint

I want to use my highfi system to output the sound, and to record from
the CDplayer, record deck, and tuner.

On the back of the Amp I can use the tape ports:
Rec, Play

I propose to connect a cable form the green output on the tower to
Play on the amp, and to connect a cable from the blue input on the
tower to the Rec on the amp. Is this corerect?

I assume that I could run with just the green to play if I like,
although I will probably connect both.

As a matter of interest, what are the orange and grey jackpoint for on
the tower.

Thanks