When using the Note Properties dialog to enter PC or PCS events into a pattern, selecting the PC or PCS note should immediately re-load the corresponding 'Volume Command' and 'Effect Type' tables on the Volume and Effects tabs (respectively). Currently, when you select either a PC or PCS note via the dialog, the "Instrument" table is already replaced by the 'Effects' table; the same behavior should be exhibited in the Volume and Effects tabs of the Note Properties dialog (referred to as NPD from here on), as well.

Also it really seems to be only 'partly' implemented in the current version; as the effect parameters do not load into the NPD selection box(es) at all on my setup (it states, if memory serves, that they indeed DO in the OHM so it could be something specific to my install I suppose..) -- only blank values you cannot select and sliders you cannot adjust are present; regardless if you just created the PC event on a blank position by double-clicking (FE: via the NPD) or if the event already existed and you double-click it to modify via the NPD. In other words: to modify a PC or PCS I can only do so via data entry and not at all via the NPD. ;)