I’ll start by saying that I primarily use Morphagene with material I’ve prepped for use with it. In other words I’ll take bits of audio and drop in markers on the computer, then transfer them to the SD card. In fact, at this very moment, I am taking a a piano progression and mangling it with the Morphagene. Here’s the naked progression:
Here’s where I am with it right now (I’m not done, but wanted to just show you where I’m headed.)
So I’ve got markers placed right before the transient of each chord. I’m manually processing with the Shift button. An LFO is patched into gene size.
I’ve got a Teletype scene set up to randomly jump between octaves via the varispeed CV control, so there’s some timbral variety. Beyond that, the rhythm is coming from a sequence of gates hitting maths, which opens a pair of VCA’s. From there, QPAS and mimeophon for processing. Not sure if I love that but yet.
And there you have it: piano bongos? 
Edit: Ok, here’s a take of this technique in the context of the song I’m working on. It sits under the original piano part and serves as a kind of drum substitute.
The final thing I’ll do is gush on @walker 's YouTube Morphagene videos. They really are all worth a watch. Morphagene will get you into some music concrete territory very quickly. I’ll often take a simple field recording of footsteps or pine cones being rubbed together and just explore them…
One more thought: these two things aren’t always mutually exclusive. Try loading in a file that’s just every note in your favorite scale played on your favorite instrument, with a marker at the beginning of each note (you could also do this in rack with a clock patched in to MG). Now you can “play” that scale with the Organize knob, or patch the end of splice gate into the Shift input (which will yield a kind of “riffing”).
I’ve used this technique to create a very playable model of my Lyra-8, and it’s a lot of fun. (This is a fun approach for Cheat Codes as well, FTR).