I asked my good friend Phil about this as I remembered he had one.
Here is his reply:
I only ever used the SR16 as a midi sound module, not as a sequencer. However, against my better judgement I dug out my sr16 and investigated this…
In Song Compose mode, if you press play, it keeps duplicating the current pattern, so starting with an empty song, you can:
select pattern 1a,
play,
stop in step 4,
move to step 5
select pattern 1b
play
stop in step 14
There you have the desired 14 bar song.
I suspect Geek99 is probably correct about the other limitations.
- Phil.
It's all greek (99!) to me, but I hope it helps.
Cheers
Jules