Minibusy.

sdr> /program=Program.A2
A2
sdr> heads lead right ; veer left
| 4B>  1B>
| 
| 4G>  1G>
| 
| 3G<  2G<
| 
| 3B<  2B<
sdr> do 1/3 of a mini-busy
|      4B>  1Bv
| 
|      4G>  1Gv
| 
| 3G^  2G<
| 
| 3B^  2B<
sdr> /// XXX that's all we can do at the moment.
sdr> /exit