There is no mention of MIDI channels when you plug in a USB MIDI keyboard at the moment because only one USB MIDI device is supported, the first one you plug in, and because all data is treated as omni (so it doesn’t care what channels your keyboard is sending on). Also, for MPE we needed all channels anyway.
The SSP is a modular synthesis / DSP platform, not a full blown DAW. It does offer a few DAW features already (like multitrack recording) and who knows, maybe down the line more features typical for DAWs will be added. It’s unrealistic to expect that we can develop a full DAW similar to Ableton Live within the span of one kickstarter campaign while simultaneously designing, developing, manufacturing and delivering the SSP.
The SSP’s user interface is optimized for eurorack workflow and for the display we use (one of the biggest and most beautiful displays in eurorack). The screen is not as big as the one you have on your desktop computer, and the user interface needs to be operated with keys and encoders (not with a mouse) so obviously all this cannot work exactly the same as it does on your computer in Ableton Live.
Those are not midi channels but voices. The incoming midi notes are assigned to voices in a round-robin fashion. So the first note arriving goes to voice 1, the second one to voice 2, and so on.
If you only press V1, there is only one voice. So the notes go to that voice. If you press V1 and V2 you have 2 voices, etc. In the first demo preset (4 voice wavetable synth) you will see that there are 4 voices in use: there are 4 midi modules and each of them is linked to a different voice. So the first midi module has V1 enabled, the second one has V2 enabled, and so on. This lets you build whatever voice architecture you want.
We made a preset like the 4 voice wavetable synth so you can simply plug in your midi keyboard (into the middle port!) and start playing. All you need to do is connect the first 2 outputs of the SSP to your mixer or your output amplifier / headphone amplifier module in your rack.
That preset also teaches you how to hook up and use the midi module. It’s already connected to the wavetable oscillators, envelopes, etc. Just browse through that patch and pay attention to how everything is patched and you’ll learn a lot.
When you play a chord, multiple notes will be received by the SSP over USB MIDI, and it will assign the notes to different voices in a round robin fashion as they come in (in the case of the 4 voice preset, up to 4 notes can be played and can sound simultaneously).
So what will happen is that the first midi module in the grid will output the data from the first note, the second midi module sends out the data from the second note, and so on.