Analogue-sequencer

After year away from the P3, I've installed the LCD and the MemX expansion and upgraded to v4.0.  I've started on a song that I like very much, but find myself at an impasse where the usage notes aren't helping.

- I have the major bits assigned to parts where I can improvise between the 5 voices with 1 part/harmonic function.
- I've added another track on the same MIDI channel as another track, I intend to mute the voice's primary track and construct a solo/bridge on its secondary track.  It plays along side the primary material for that part.
- I've defined the new track to have 8 bars that play with the primary material and edited the first bar.  It has notes/gates/aux events, etc.
- I go into bar edit mode and select the bar for editing.  
- Beyond this I can't seem to do anything apart from copying the first bar into another bar and transposing/repeating it.  I don't know how to get into the bar in question.

Clearly I'm not reading something in the usage notes correctly.  I suspect there's an analogy between playlist/bar functionality that I've forgotten. 

thanks,
eric w f