This is a precision active buffer and multi which has outstanding performance, it features very high input impedance, very low output impedance and an offset voltage of <1mV.
In addition to being a very accurate precision buffered multi, AJH have added a very useful (and unique) feature to cure tracking problems - four of the five outputs can be adjusted up or down by +/-5% from the front panel, so that VCO’s and VCF’s that don’t track 1V/Oct exactly can be easily compensated to track correctly without having to re-calibrate the VCO or VCF themselves.