In the Track Settings (ALT+Track) you can set a Transpose offset of 24 semitones, that will give you a 2 volt offset.
An External option would be to use an offset module or adder to add 2v to the pitch output, then you could keep the +/-5V max range of the Metropolix output.
Piston Honda MKIII dual wavetable oscillator, pretty badass combo with Metropolix, automating wavetables and morphing presets in realtime while the sequence is running, pretty awesome