The SD5 does have a sequencer on board (just not a 16 tracks one with thorough editing capabilities).

You can ...

A. Use the Arranger (pre-record sequences or your own recorded in C) which already uses 8 tracks plus 1-4 more for lead so a total of 12 tracks...in this case, you would have to play as you record...

OR

B. Use the Arranger alone (with chord variation recorded within) and record up to 32 measures per variation of the various song parts. When completed, compile in real-time ... however the final recording process to disk is only once while the arranger recording process into memory is open to 8 tracks per arrangement!!

Hope this helps.

Thanks,

AJ