Hi John,
The new BP16 preamp has source select and 2 pairs of RCA out.
The BP26 has 1 pair of balanced out and 2 pairs of RCA.
Back when we designed the BP 25 and now the BP26 source select was a problem because other than motorized pots there were not any transparent systems available to switch sources so we decided to take a more purist approach and use the motorized pot on the volume control which we felt more customers would use.
james