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Yeah I saw that. What I couldn't find in the manual, does it do quantization?
Anyhow, I only have a Raspberry Pi B (the old one with 512MB RAM), I did some tests where I was trying to use it as an USB midi to din midi adapter using an 1x1 USB midi adapter and ALSA, but unfortunately that wasn't working very well (had stuck/missing notes all the time), so I guess the old PI isn't fast enough...

I'n using Raspberry Pi 3. Never tried the setup with Raspberry Pi 2 which I also have, and I use it as hybrid MIDI Thru / MIDI USH hub device. Seq24 is capable of doing quantization while recording MIDI notes/events. To be honest, I use Alesis MMT-8 for quick MIDI jams. I draw notes via mouse on seq24. But yes, you can use external MIDI keyboard to record MIDI sequences on seq24. I tried that many moons ago, and it works.