I'm explaining what all the parameters in the menus of the octatracks midi mode do.
0:00 intro
0:42 connecting to an external synth
1:28 midi mode
2:01 assigning a midi channel
2:57 basic sequencing (step)
3:34 note
4:22 velocity
5:25 note length
6:03 note 2, 3 and 4
7:21 programm change
8:12 arp mode
9:16 arp octave range
10:11 arp speed
11:09 arp note length
12:03 arp transpose
12:45 legato
14:36 midi arp setup
16:00 note quantization
18:37 LFOs
19:17 LFO mod destinations
21:08 LFO trig types
22:21 MIDI CCs
24:53 assigning CCs
26:10 parameter locking CCs
26:23 CCs as LFO destination
26:50 sequencer trig types
29:05 two way connection
31:02 MIDI CC Learn
32:38 midi channels for audio tracks
34:20 live recording
36:32 swing
37:23 micro timing
37:41 probabilities/trig conditions
39:21 multiple tracks using the same MIDI channel