I want to know what cables I need in order to play Logic Studio’s softwares instruments without any Audio interface(Using Macbook outputs)in stereo?

Re: Using Macbook’s output

The only available hardware stereo output on the Macbook is the stereo headphone out. It is a stereo “mini” phone jack. I suppose you could rig up an adapter which would be stereo mini phone jack on one
end, to a Y-cable with either RCA male or 1/4” male jacks on the
other.

But trust me - the Macbook’s output (and the output of every laptop on the planet) stinks - the “quality” of audio will be super poor. You should
always hook up a Fire Wire audio/midi interface for any kind of audio
work on your Macbook and Logic.

Plus, without a FireWire audio/MIDI interface, you will have no way to get any audio into Logic, or sync your MIDI keyboard - at all. So unless you just want to entertain yourself by playing back Logic’s loops or pre-recorded projects, you will “have” to buy an audio/MIDI interface for it.

I see you have a Focusrite Saffire, why aren’t you using that with your Macbook?

Re: Using Macbook’s output

I was planning to do it without the interface( less equipment) for only play the software instruments on Logic but you are right I have to use the Focusrite .