The "Booster" jack is basically a "line-out" jack...... You can use a mike cable to go into a mixer-board or go into a Power-amp such as the CS-800.
I am not sure if the signal path of the "Nashville 400" is broken or not,I will check that for you if you want.
My older sessions 400 amp booster jack is:
taped right off the speaker. it has a 15k resistor to groung and a 47k feed-thru resistor. It does NOT break the signal path to the power-amp or the speaker. I can send you a printout of it if you wish.
[This message was edited by Bill Crook on 26 October 2001 at 08:08 AM.]