Analogue-sequencer

Just to explain what's happening in the 'brownian' direction mode - 
after each step plays, a random number is generated. This single byte 
value has a range of 0 to 255. If the value is greater than 127, the 
sequence moves to the next step. If the value is between 0 and 31, 
the sequence moves to the previous step. Between 32 and 127, it stays 
in the same place. This gives a 'drunken walk' progression through 
the sequence, that manages to keep going in a mostly forward 
direction. I might play about with the probabilities a bit - changing 
the balance, or possibly adding a low probability of jumping two 
steps forward or back.
Any suggestions for other direction modes are welcome.

Cheers,
Colin f