Elektron Musical Instruments

hi all,

I'm just a newbie trying to get my head around the paradigm of the
SidStation.

As I understand it, in poly mode we can have 3 independent notes playing.

1. are they all of the same instrument sound?
2. big question: since my MIDI sequencer will be triggering notes on one
MIDI channel, how does the SidStation allocate the 3 voices?  Does it just
turn off the first of the notes and start playing a new one?

Finally, I love all the old c64 tunes which obviously have percussion and
bass and lead all at once.  Is it a real nightmare to write one of these
using a MIDI sequencer, because there's only one MIDI channel?  (I'd buy a
SidStation right away but I'm concerned about this...)

thanks!

- Brendan