Don't worry too much...
You get the better sequencer in the MIDIs history, in my opinion, but need some help to learn about. My first mc50 come in 1991.
I'll explain some topics to help you.
1- don't power up the mc50 with a disk in
the drive (to prevent some unmissing
configuration)
2- it have 2 MIDI out, the port 2 have a
Thru option on default configuration. Use
the port 1 to send to master keyboard and
the port 2 to send to other devices and
modules.
3- also have the rhythm track, to record in
that, set the option REAL to RHYTHM and
press the rec button. Then select first
pattern, press sometimes the enter to
select a display with ............ in the
down line.
Press shift+play and record the pattern
loop(make sure to set the channel 10 in
the master).
After this, press stop, press rec and
select the r-track, press enter, and
select the pattern that you record
(ex:1), everytime the bias option in zero
(0).
Repeat this procedure to record other
patterns and assembly your rhythm track.
I hope help you.
Any doubt contact me at
bortolato1@yahoo.com
Greatins from Brazil.