Dear Mr.Hugh Wallington, it's impossible. GalaxyAce 2 does not have additional outlet to attach to.
So that is a "no". Even though I now have a Samsung Galaxy J3 I don't think that would do it either.
I thought at this point I would listen to one of Peter's recordings and opted for Estate (pronounced est-art-ay). Here is his SoundCloud recording, which he did as a WAV file from his Korg PA4 and then converted the WAV to MP3. This is one of my favourite recordings from Peter, and you can hear from the quality of what you are listening to that it is in STEREO
Click the orange marker on the Soundcloud LINK below to ‘Play’.
https://soundcloud.com/peter-s-7/estate ... x-keyboard
And the waveform of this from running the MP3 through Audacity is below:
.. which confirms that this is a STEREO recording as the left and right channels are completely different.
Now his YouTube upload of this song, done with his iPhone 6.
Just listening to this, one can tell that this is not Stereo, but 2-track MONO. Below is the waveform from Audacity:
The left and right channels are exactly the same, which confirms that this is 2-track MONO.
So here is the question. Can the iPhone 6 record in STEREO, or not? It's not the Keyboard, as the SoundCloud recording confirms the Korg PA4 gives a Stereo recording.
I checked a later recording that Peter had done for YouTube, Save A Prayer Till The Morning After, and that too was in 2-track mono, confirmed by the waveform below.
When I told Peter all this, his reaction was:
No, I didn't realise they were not stereo. That does surprise me. The two recordings you mention were made using my iPhone directly wired, for a You Tube video.
Some research required, I think!