raspiano: Music with a MIDI keyboard and a Raspberry Pi

I have a Masterkey USB MIDI keyboard, computer speakers, a Raspberry Pi 3, so I put them together to make a music machine for my toddler. Hardware is straightforward – keyboard to USB, speakers to round jack – and the following post is very helpful to configure ALSA and FluidSynth: http://andrewdotni.ch/blog/2015/02/28/midi-synth-with-raspberry-p/