1: The MIDIbox SID firmware already comes with a 3 track 32 step sequencer with very powerfull functions (especially the combination between this sequencer and the arpeggiator makes a lot of fun). You have to modify the source code if you want to have another user interface like dedicated buttons for the sequencer, more LEDs or whatever
2: the MIOS based MB64SEQ is nearly finished, you can try to combine the applications after the release if you want
To both questions: due to lack of sparetime I’m currently not able to give explicit programming hints, this is your job
The seq_core is functional and bugfree, only some minor features are not available yet, and especially the user interface has to be completed. But for your sequencer you need to change the cs_* anyhow, so the current state is a better starting point (it will get more complex in the future)
I haven’t continued on this code since a month (biggest blocking point: the intensive heatwave here in Europe, last week we had a new temperature record in germany with more than 40 °C - under these conditions programming doesn’t make fun
It’s quite a shame that I am very busy at work at the moment, as well as moving house, and also moving in with my girlfriend :-* so I might not make much progress either for a little while… But I will be playing with the new sequencer in no time, mark my words
Hope you are OK with the heat… I just about did a backflip last night when I heard on the news that in England they had 38C… That’s almost as hot as Australia in summer… I know if we had your snowy cold weather, we would all freeze to death, so I hope you don’t melt away in our steamy hot weather!
I haven’t continued on this code since a month (biggest blocking point: the intensive heatwave here in Europe, last week we had a new temperature record in germany with more than 40 °C  - under these conditions programming doesn’t make fun
lol. Welcome to our world Thorsten. We have weeks of this weather on end mate.. ;D Do it the Australian way, learn to sweat and solder buddy!! ;D ;D :-*