help w/ spectra(desktrac) dip and acc plug...

[radio64]

Just got the Spectra style desktrac unit, haven't picked up a manual yet. Hoping someone here can help me though... Wondering what are the 'assignments' for the dip switches on the main pc board, and accessory plug 2 (or 3) wiring (i.e. looking to put an external speaker for this unit if possible) any help much appreciated (or maybe leads to a manual for this and / or the desktrac unit, got a couple of those too...) Thanks, Ben N2ROQ