Assigning AOUT offset to the User2 button matrix knobs

MIDIbox FM
1

I’m building a midibox fm. I’ve got all the circuit and control surface built, working and sounding good but I want to add a pair of AOUT LC and a pair of filters.

I’m planning on building the EMS diode ladder filters described here.. http://www.modular.fonik.de/Page37.html They have CV control of cutoff AND resonance so I think they should work nicely. I’m trying to incorporate these filters so the cutoff and resonance settings are completely saved with the patch and don’t require any external potentiometers.

I want to be able to tweak the cutoff and resonance from the v-pots so I figured I could remap the USER 2 v-pots to control the cutoff and resonance via the AOUT offset parameters.

In cs_menu_tables.inc at line 420 I figure I should change it to something like…

;; USER2 Register (00=dummy) |<-->| max print ix, exec ix parameter transfer

	CS_MENU_ENTRY	MBFM_AOUTx_OFFSET, "Cut1", 0x7f, PRINT_AOUTxOFFS, EXEC_SELPAR, R2PP2R_AOUTxOFFS

	CS_MENU_ENTRY	MBFM_AOUTx_OFFSET, "Res1", 0x7f, PRINT_AOUTxOFFS, EXEC_SELPAR, R2PP2R_AOUTxOFFS

	CS_MENU_ENTRY	MBFM_AOUTx_OFFSET, "Cut2", 0x7f, PRINT_AOUTxOFFS, EXEC_SELPAR, R2PP2R_AOUTxOFFS

	CS_MENU_ENTRY	MBFM_AOUTx_OFFSET, "Res2", 0x7f, PRINT_AOUTxOFFS, EXEC_SELPAR, R2PP2R_AOUTxOFFS

…but I’m not sure if this will work as I expect. Will the v-pots control AOUT 1-4 offsets respectively or just control the same offset of whatever AOUT is selected in the AOUT menu?

Is there another way of mapping this?

2

It looks like AOut offset is part of the ensemble not the instrument. I’ve found it’s better to leave the offset at -63 and use the AOut depth in EG5 to sweep the filter.

3

I’ve also noticed what looks like a bug. The Instrument assign numbers in the AOut menu show the values 5,6,7 and 8 instead of 1,2,3 and 4.