I think your information is slightly out-dated. The most current core is STM32F4 based. The PIC core is at the end of capabilities. Your PIC is not even supported and would require you to rewrite code.
I would recommend you move to the STM32F4, it's not that expensive. You can then use the Midibox NG project which is aimed at controllers.
Two questions regarding Seq4 CV:
1) Can the AOUT_NG be powered with +/- 15 volts (instead of +/- 12) ?
2) I want to use an AOUT_NG and a DOUT in the breakout box within my modular cabinet. From there I should be able to patch the CV and the trigger outs to various modules with patch cables up to 2m long, correct ?
thanks! Drew