This video shows a track called “Future Is Now” – produced entirely on the iPhone.
When I left college I remember realising that I missed making music. The solution was an Amiga 1200 computer running OctaMed - capable of playing a whopping 8 simultaneous sounds, albeit only 8-bit samples, and typically at 16 kHz sample rate max. (Yes, that means the frequency cut-off was 8K)
The Amiga was roughly the size of a DVD player, more expensive then than an iPod Touch is now, and you needed a TV and hi-fi to plug it into.