It’s an old trick from Elektron sequencers but I was pleased it works on the PT too.
If you want to choose between two samples on a step, place one sample on the step and the alternative sample on the step before that. Then, on the first sample, put a micro-timing FX on FX1 and set it to 100 then put a chance FX on FX2, set to say 50.
Now when you play the sequence you’ll randomly get one of the two sounds played on the later step.
00 -- -- ---- ----
01 -- -- ---- ----
02 C5 02 M100 C 50
03 C5 01 ---- ----
04 -- -- ---- ----
00 -- -- ---- ----
e.g this will play either sound 01 or sound 02 on step 03, 50% chance. It works by pushing the first sample one whole step but because each track is mono it can only ever play one or the other.
You have to have the alternative sample on the step before the step you want it triggering on because the micro-timing FX can only be positive (on Elektron you can shift things forwards or backwards).
It might be obvious but this also works with other parameters, not just the sample selection. For example:
00 --- -- ---- ----
01 C 5 01 M100 C 50
02 D#5 01 ---- ----
03 --- -- ---- ----
Will randomly play a C5 or a D#5 on step 02
